| 
                        R-5204-7C-O
                     | 
                    BENEDUM SPRABERRY UNIT | 
                    
                        BENEDUM (SPRABERRY) (7109875)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        18
                     | 
                
                
                    | 
                        R-9987-7C-O
                     | 
                    GETTY-UNIVERSITY | 
                    
                        BENEDUM (FUSSELMAN) (7109500)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-37212-8-O
                     | 
                    HINSHAW-UNIVERSITY | 
                    
                        HUTEX (DEVONIAN) (43878800)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-11743-7C-O
                     | 
                    ST "F" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-12073-7C-O
                     | 
                    ST "K" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-12082-7C-O
                     | 
                    ST "L" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-12529-7C-O
                     | 
                    STATE "N" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-12963-7C-O
                     | 
                    STATE "O" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-12894-7C-O
                     | 
                    STATE "T" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-11615-7C-O
                     | 
                    TENNECO-UNIVERSITY "B" | 
                    
                        BENEDUM (FUSSELMAN) (7109500)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-131037-7C-G
                     | 
                    TENNECO-UNIVERSITY | 
                    
                        BENEDUM (FUSSELMAN) (7109500)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-9541-7C-O
                     | 
                    TEXON "8" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9016710-8-O
                     | 
                    ULS "5-24" | 
                    
                        BLOCK 6 (STRAWN) (9172750)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9126410-8-O
                     | 
                    UNIVERISTY "7-23" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-40833-8-O
                     | 
                    UNIVERISTY "7-43" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        16
                     | 
                
                
                    | 
                        R-16484-7C-O
                     | 
                    UNIVERSITY "10-1" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        12
                     | 
                
                
                    | 
                        R-16290-7C-O
                     | 
                    UNIVERSITY "10-10" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        R-16900-7C-O
                     | 
                    UNIVERSITY "10-13" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        9
                     | 
                
                
                    | 
                        R-16804-7C-O
                     | 
                    UNIVERSITY "10-14" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        P-9114840-7C-O
                     | 
                    UNIVERSITY "10-14" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17997-7C-O
                     | 
                    UNIVERSITY "10-16" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17944-7C-O
                     | 
                    UNIVERSITY "10-17" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        R-17531-7C-O
                     | 
                    UNIVERSITY "10-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        19
                     | 
                
                
                    | 
                        P-9073400-7C-O
                     | 
                    UNIVERSITY "10-19" | 
                    
                        TRIGG (STRAWN) (91212600)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9093430-7C-O
                     | 
                    UNIVERSITY "10-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9114860-7C-O
                     | 
                    UNIVERSITY "10-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16298-7C-O
                     | 
                    UNIVERSITY "10-2" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        R-16648-7C-O
                     | 
                    UNIVERSITY "10-3" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        5
                     | 
                
                
                    | 
                        R-16672-7C-O
                     | 
                    UNIVERSITY "10-5" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9197020-7C-O
                     | 
                    UNIVERSITY "10-5" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16379-7C-O
                     | 
                    UNIVERSITY "10-9" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        R-16742-7C-O
                     | 
                    UNIVERSITY "1-10" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9211710-7C-O
                     | 
                    UNIVERSITY "1-10" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16691-7C-O
                     | 
                    UNIVERSITY "1-13" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9260810-7C-O
                     | 
                    UNIVERSITY "1-17" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16744-7C-O
                     | 
                    UNIVERSITY "1-21" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        R-12941-7C-O
                     | 
                    UNIVERSITY "12-12" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        P-9126900-7C-O
                     | 
                    UNIVERSITY "12-12A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-18163-7C-O
                     | 
                    UNIVERSITY "1-22" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16407-7C-O
                     | 
                    UNIVERSITY "1-24" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16336-7C-O
                     | 
                    UNIVERSITY "1-27" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-9260820-7C-O
                     | 
                    UNIVERSITY "1-27" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-18438-7C-O
                     | 
                    UNIVERSITY "1-28" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9058370-7C-O
                     | 
                    University "12-9" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9260800-7C-O
                     | 
                    UNIVERSITY "1-3" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-9876-7C-O
                     | 
                    University "13" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        8
                     | 
                
                
                    | 
                        R-16344-7C-O
                     | 
                    UNIVERSITY "1-33" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        P-9133690-7C-O
                     | 
                    UNIVERSITY "1-33" | 
                    
                        GRIERSON SPRING (STRAWN) (36953500)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16375-7C-O
                     | 
                    UNIVERSITY "1-34" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        5
                     | 
                
                
                    | 
                        P-773275-7C-O
                     | 
                    UNIVERSITY "1-34" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-773282-7C-O
                     | 
                    UNIVERSITY "1-34" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-773291-7C-O
                     | 
                    UNIVERSITY "1-34" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-18229-7C-O
                     | 
                    UNIVERSITY "15" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-5646-7C-O
                     | 
                    UNIVERSITY "15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        5
                     | 
                
                
                    | 
                        R-17432-7C-O
                     | 
                    UNIVERSITY "15-18" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        P-9150300-7C-O
                     | 
                    UNIVERSITY "15-18" | 
                    
                        BLUE DANUBE (STRAWN) (09804750)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-18769-7C-O
                     | 
                    UNIVERSITY "15B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-18872-7C-O
                     | 
                    UNIVERSITY "178B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        P-805638-7C-O
                     | 
                    UNIVERSITY "178B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-805686-7C-O
                     | 
                    UNIVERSITY "178B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16751-7C-O
                     | 
                    UNIVERSITY "1-9" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16593-7C-O
                     | 
                    UNIVERSITY "2-10" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16565-7C-O
                     | 
                    UNIVERSITY "2-10A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9217730-7C-O
                     | 
                    UNIVERSITY "2-10A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16445-7C-O
                     | 
                    UNIVERSITY "2-14" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-237371-7C-G
                     | 
                    UNIVERSITY "2-14" | 
                    
                        BIG LAKE (STRAWN) (7919747)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17468-7C-O
                     | 
                    UNIVERSITY "2-18" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        P-9006160-7C-O
                     | 
                    UNIVERSITY "2-18" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16589-7C-O
                     | 
                    UNIVERSITY "2-20" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        48
                     | 
                
                
                    | 
                        P-787558-7C-O
                     | 
                    UNIVERSITY "2-20" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16806-7C-O
                     | 
                    UNIVERSITY "2-21" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        P-9216650-7C-O
                     | 
                    UNIVERSITY "2-21" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9217740-7C-O
                     | 
                    UNIVERSITY "2-21" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17303-7C-O
                     | 
                    UNIVERSITY "2-22" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-9217750-7C-O
                     | 
                    UNIVERSITY "2-22" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17684-7C-O
                     | 
                    UNIVERSITY "2-22A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9216660-7C-O
                     | 
                    UNIVERSITY "2-22A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9216670-7C-O
                     | 
                    UNIVERSITY "2-22A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17315-7C-O
                     | 
                    UNIVERSITY "2-28" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        7
                     | 
                
                
                    | 
                        P-97140-7C-O
                     | 
                    UNIVERSITY "2-28" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9211660-7C-O
                     | 
                    UNIVERSITY "2-29" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17319-7C-O
                     | 
                    UNIVERSITY "2-30" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        5
                     | 
                
                
                    | 
                        P-9011490-7C-O
                     | 
                    UNIVERSITY "2-30" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9211670-7C-O
                     | 
                    UNIVERSITY "2-32" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16872-7C-O
                     | 
                    UNIVERSITY "2-33" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16677-7C-O
                     | 
                    UNIVERSITY "2-33A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-17712-7C-O
                     | 
                    UNIVERSITY "2-34" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-9002300-7C-O
                     | 
                    UNIVERSITY "2-34" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17859-7C-O
                     | 
                    UNIVERSITY "2-35C" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9211680-7C-O
                     | 
                    UNIVERSITY "2-35C" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16268-7C-O
                     | 
                    UNIVERSITY "2-4" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16574-7C-O
                     | 
                    UNIVERSITY "24" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-9058380-7C-O
                     | 
                    University "2-5" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17818-7C-O
                     | 
                    UNIVERSITY "2-7" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9217710-7C-O
                     | 
                    UNIVERSITY "2-9" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9217720-7C-O
                     | 
                    UNIVERSITY "2-9" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17399-7C-O
                     | 
                    UNIVERSITY "3-1" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        5
                     | 
                
                
                    | 
                        R-5629-7C-O
                     | 
                    UNIVERSITY "31" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-9277250-7C-O
                     | 
                    UNIVERSITY "3-1" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9193500-7C-O
                     | 
                    UNIVERSITY "3-10" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9227050-7C-O
                     | 
                    UNIVERSITY "3-10" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9260840-7C-O
                     | 
                    UNIVERSITY "3-10" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17749-7C-O
                     | 
                    UNIVERSITY "3-12" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9277260-7C-O
                     | 
                    UNIVERSITY "3-12" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-794463-7C-O
                     | 
                    UNIVERSITY "3-13" PU | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-794531-7C-O
                     | 
                    UNIVERSITY "3-13" PU | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-794534-7C-O
                     | 
                    UNIVERSITY "3-13" PU | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17516-7C-O
                     | 
                    UNIVERSITY "3-13" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16493-7C-O
                     | 
                    UNIVERSITY "3-13A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        R-16524-7C-O
                     | 
                    UNIVERSITY "3-14" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        37
                     | 
                
                
                    | 
                        P-795526-7C-O
                     | 
                    UNIVERSITY "3-14" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9235410-7C-O
                     | 
                    UNIVERSITY "3-14" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16660-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        26
                     | 
                
                
                    | 
                        R-20360-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-799531-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-799536-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-799537-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-799553-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-799555-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-799557-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-806996-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-852504-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-852505-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-852506-7C-O
                     | 
                    UNIVERSITY "3-15" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21113-7C-O
                     | 
                    UNIVERSITY "3-15A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21114-7C-O
                     | 
                    UNIVERSITY "3-15B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21115-7C-O
                     | 
                    UNIVERSITY "3-15C" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16382-7C-O
                     | 
                    UNIVERSITY "3-16" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        P-9217770-7C-O
                     | 
                    UNIVERSITY "3-16" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9217780-7C-O
                     | 
                    UNIVERSITY "3-16" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9217790-7C-O
                     | 
                    UNIVERSITY "3-16" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9217800-7C-O
                     | 
                    UNIVERSITY "3-16" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16376-7C-O
                     | 
                    UNIVERSITY "3-17" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        7
                     | 
                
                
                    | 
                        P-9058490-7C-O
                     | 
                    UNIVERSITY "3-18" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-773654-7C-O
                     | 
                    UNIVERSITY "3-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-788190-7C-O
                     | 
                    UNIVERSITY "3-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-801363-7C-O
                     | 
                    UNIVERSITY "3-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-801365-7C-O
                     | 
                    UNIVERSITY "3-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-806043-7C-O
                     | 
                    UNIVERSITY "3-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-806044-7C-O
                     | 
                    UNIVERSITY "3-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-806049-7C-O
                     | 
                    UNIVERSITY "3-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-806668-7C-O
                     | 
                    UNIVERSITY "3-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16449-7C-O
                     | 
                    UNIVERSITY "3-20" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-17729-7C-O
                     | 
                    UNIVERSITY "3-21" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-740765-7C-O
                     | 
                    UNIVERSITY "3-21" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9300820-7C-O
                     | 
                    UNIVERSITY "3-22" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9013790-7C-O
                     | 
                    UNIVERSITY "3-22A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9210680-7C-O
                     | 
                    UNIVERSITY "3-22A" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16517-7C-O
                     | 
                    UNIVERSITY "3-26" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16468-7C-O
                     | 
                    UNIVERSITY "3-28" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16499-7C-O
                     | 
                    UNIVERSITY "3-31" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        5
                     | 
                
                
                    | 
                        R-19544-7C-O
                     | 
                    UNIVERSITY "3-310PU" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        R-16718-7C-O
                     | 
                    UNIVERSITY "3-32" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-787932-7C-O
                     | 
                    UNIVERSITY "3-32" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9092870-7C-O
                     | 
                    UNIVERSITY "3-32" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16497-7C-O
                     | 
                    UNIVERSITY "3-33" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        8
                     | 
                
                
                    | 
                        P-771855-7C-O
                     | 
                    UNIVERSITY "3-33" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17132-7C-O
                     | 
                    UNIVERSITY "3-35" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-19258-7C-O
                     | 
                    UNIVERSITY "3-67" PU | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-18258-7C-O
                     | 
                    UNIVERSITY "4-18" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16781-7C-O
                     | 
                    UNIVERSITY "4-19" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17703-7C-O
                     | 
                    UNIVERSITY "4-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        5
                     | 
                
                
                    | 
                        R-16754-7C-O
                     | 
                    UNIVERSITY "4-20" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-18072-7C-O
                     | 
                    UNIVERSITY "4-20" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-17539-7C-O
                     | 
                    UNIVERSITY "4-29C" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16771-7C-O
                     | 
                    UNIVERSITY "4-3" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21265-7C-O
                     | 
                    UNIVERSITY "4-7A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21264-7C-O
                     | 
                    UNIVERSITY "4-7B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21266-7C-O
                     | 
                    UNIVERSITY "4-7C" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16792-7C-O
                     | 
                    UNIVERSITY "4-8" | 
                    
                        SHEEP MOUNTAIN (CONSOLIDATED)            (82857300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16925-7C-O
                     | 
                    UNIVERSITY "4-8" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        R-17875-7C-O
                     | 
                    UNIVERSITY "58-18" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-8792-7C-O
                     | 
                    UNIVERSITY "58-18-D" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17342-7C-O
                     | 
                    UNIVERSITY "58-19" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        R-16761-7C-O
                     | 
                    UNIVERSITY "58-19A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-9211690-7C-O
                     | 
                    UNIVERSITY "58-19A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16571-7C-O
                     | 
                    UNIVERSITY "58-27" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16554-7C-O
                     | 
                    UNIVERSITY "58-28" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        P-9197030-7C-O
                     | 
                    UNIVERSITY "58-28" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9197040-7C-O
                     | 
                    UNIVERSITY "58-28" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9197050-7C-O
                     | 
                    UNIVERSITY "58-29" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9260790-7C-O
                     | 
                    UNIVERSITY "58-29" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16591-7C-O
                     | 
                    UNIVERSITY "58-31" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16481-7C-O
                     | 
                    UNIVERSITY "58-32" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        5
                     | 
                
                
                    | 
                        P-773856-7C-O
                     | 
                    UNIVERSITY "58-32" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16576-7C-O
                     | 
                    UNIVERSITY "58-5" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        R-16494-7C-O
                     | 
                    UNIVERSITY "58-6" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        R-16624-7C-O
                     | 
                    UNIVERSITY "58-6B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        BCP RESOURCES, LLC (0000040206) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16498-7C-O
                     | 
                    UNIVERSITY "58-7" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        8
                     | 
                
                
                    | 
                        R-17705-7C-O
                     | 
                    UNIVERSITY "58-8" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-16492-7C-O
                     | 
                    UNIVERSITY "58-9" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        R-17608-7C-O
                     | 
                    UNIVERSITY "58-9A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        R-41339-8-O
                     | 
                    UNIVERSITY "6-11" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9012910-8-O
                     | 
                    UNIVERSITY "6-11" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-41432-8-O
                     | 
                    UNIVERSITY "6-12" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-41777-8-O
                     | 
                    UNIVERSITY "6-13" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-42887-8-O
                     | 
                    UNIVERSITY "6-13" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-773546-8-O
                     | 
                    UNIVERSITY "6-13" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9017210-8-O
                     | 
                    UNIVERSITY "6-13" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-39327-8-O
                     | 
                    UNIVERSITY "6-16" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-9151070-8-O
                     | 
                    UNIVERSITY "6-16" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-38619-8-O
                     | 
                    UNIVERSITY "6-17" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        R-42632-8-O
                     | 
                    UNIVERSITY "6-18A" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        P-9300850-8-O
                     | 
                    UNIVERSITY "6-18A" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9300860-8-O
                     | 
                    UNIVERSITY "6-18A" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9300870-8-O
                     | 
                    UNIVERSITY "6-18A" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9302480-8-O
                     | 
                    UNIVERSITY "6-18A" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9302490-8-O
                     | 
                    UNIVERSITY "6-18A" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9302500-8-O
                     | 
                    UNIVERSITY "6-18A" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-95283-8-O
                     | 
                    UNIVERSITY "6-18A" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-99661-8-O
                     | 
                    UNIVERSITY "6-18A" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-38587-8-O
                     | 
                    UNIVERSITY "6-25" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        P-9141790-8-O
                     | 
                    UNIVERSITY "6-25" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-40223-8-O
                     | 
                    UNIVERSITY "6-25A" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-42586-8-O
                     | 
                    UNIVERSITY "6-25B" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-94761-8-O
                     | 
                    UNIVERSITY "6-25B" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-43089-8-O
                     | 
                    UNIVERSITY "6-26" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9182290-8-O
                     | 
                    UNIVERSITY "6-26" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-41772-8-O
                     | 
                    UNIVERSITY "6-32" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9017320-8-O
                     | 
                    UNIVERSITY "6-32" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9201570-8-O
                     | 
                    UNIVERSITY "6-32" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-39831-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        11
                     | 
                
                
                    | 
                        P-9098680-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9125290-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9143430-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9150600-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9168080-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9207750-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9207760-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9207770-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9298430-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9298440-8-O
                     | 
                    UNIVERSITY "6-39" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-39857-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        11
                     | 
                
                
                    | 
                        P-9012930-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9016480-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9205540-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9205570-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9205580-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9278330-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9278340-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9278350-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9308390-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9308400-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-96075-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-97057-8-O
                     | 
                    UNIVERSITY "6-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-39937-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        8
                     | 
                
                
                    | 
                        P-9012920-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9013840-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
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                    | 
                        P-9017280-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9070280-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9134180-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9150360-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9244330-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9303280-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9303290-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9303300-8-O
                     | 
                    UNIVERSITY "6-45" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-41237-8-O
                     | 
                    UNIVERSITY "6-48" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9006830-8-O
                     | 
                    UNIVERSITY "6-48" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-42690-8-O
                     | 
                    UNIVERSITY "6-49" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        R-43334-8-O
                     | 
                    UNIVERSITY "6-49" | 
                    
                        SATELLITE (DEVONIAN) (81160080)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9150630-8-O
                     | 
                    UNIVERSITY "6-49" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9151050-8-O
                     | 
                    UNIVERSITY "6-49" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9151060-8-O
                     | 
                    UNIVERSITY "6-49" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9298410-8-O
                     | 
                    UNIVERSITY "6-49" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9298420-8-O
                     | 
                    UNIVERSITY "6-49" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-97647-8-O
                     | 
                    UNIVERSITY "6-49" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
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                    | 
                        R-40157-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        10
                     | 
                
                
                    | 
                        P-9013850-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9098670-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9117630-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9171230-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9288530-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9288540-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9288550-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9325780-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9325790-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-96882-8-O
                     | 
                    UNIVERSITY "7-1" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-38589-8-O
                     | 
                    UNIVERSITY "7-11" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        P-9016340-8-O
                     | 
                    UNIVERSITY "7-11" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9300830-8-O
                     | 
                    UNIVERSITY "7-11" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9300840-8-O
                     | 
                    UNIVERSITY "7-11" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-38502-8-O
                     | 
                    UNIVERSITY "7-15" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        9
                     | 
                
                
                    | 
                        P-726483-8-O
                     | 
                    UNIVERSITY "7-15" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9096100-8-O
                     | 
                    UNIVERSITY "7-15" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9114870-8-O
                     | 
                    UNIVERSITY "7-15" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9288570-8-O
                     | 
                    UNIVERSITY "7-15" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9326750-8-O
                     | 
                    UNIVERSITY "7-15" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-94762-8-O
                     | 
                    UNIVERSITY "7-15" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-38578-8-O
                     | 
                    UNIVERSITY "7-18" | 
                    
                        LACAFF (DEAN) (51152500)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-40180-8-O
                     | 
                    UNIVERSITY "7-18" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        P-9015410-8-O
                     | 
                    UNIVERSITY "7-18" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9016580-8-O
                     | 
                    UNIVERSITY "7-18" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9070290-8-O
                     | 
                    UNIVERSITY "7-18" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9070830-8-O
                     | 
                    UNIVERSITY "7-18" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-41572-8-O
                     | 
                    UNIVERSITY "7-1A" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        3
                     | 
                
                
                    | 
                        P-9308360-8-O
                     | 
                    UNIVERSITY "7-1A" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9308370-8-O
                     | 
                    UNIVERSITY "7-1A" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9308380-8-O
                     | 
                    UNIVERSITY "7-1A" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-98726-8-O
                     | 
                    UNIVERSITY "7-1A" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-40394-8-O
                     | 
                    UNIVERSITY "7-22" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        P-9086330-8-O
                     | 
                    UNIVERSITY "7-23" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9125300-8-O
                     | 
                    UNIVERSITY "7-23" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9150310-8-O
                     | 
                    UNIVERSITY "7-23" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9150320-8-O
                     | 
                    UNIVERSITY "7-23" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9363890-8-O
                     | 
                    UNIVERSITY "7-23" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9363920-8-O
                     | 
                    UNIVERSITY "7-23" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9231320-8-O
                     | 
                    UNIVERSITY "7-25" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-40307-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        10
                     | 
                
                
                    | 
                        P-9015710-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9114880-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9125310-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9143420-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9205560-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9278270-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9278280-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-97732-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-97733-8-O
                     | 
                    UNIVERSITY "7-29" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9016990-8-O
                     | 
                    UNIVERSITY "7-34" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9070840-8-O
                     | 
                    UNIVERSITY "7-34" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9071370-8-O
                     | 
                    UNIVERSITY "7-34" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9100540-8-O
                     | 
                    UNIVERSITY "7-34" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9102150-8-O
                     | 
                    UNIVERSITY "7-34" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9134190-8-O
                     | 
                    UNIVERSITY "7-34" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-94697-8-O
                     | 
                    UNIVERSITY "7-34" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-42432-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        22
                     | 
                
                
                    | 
                        P-729117-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9000990-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9130300-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9205590-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9206600-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9218840-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9232340-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9232350-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9232360-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9232370-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9245400-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9245410-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9278290-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9278300-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9298360-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9298370-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9298380-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        HILL RANCH (MISS) (41462666)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-94696-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-95061-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-97648-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-99457-8-O
                     | 
                    UNIVERSITY "7-38" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-40530-8-O
                     | 
                    UNIVERSITY "7-39" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        P-9150830-8-O
                     | 
                    UNIVERSITY "7-39" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9151150-8-O
                     | 
                    UNIVERSITY "7-39A" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9245380-8-O
                     | 
                    UNIVERSITY "7-39A" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9245390-8-O
                     | 
                    UNIVERSITY "7-39A" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9141770-8-O
                     | 
                    UNIVERSITY "7-42" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9141780-8-O
                     | 
                    UNIVERSITY "7-42" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9150710-8-O
                     | 
                    UNIVERSITY "7-42" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9150720-8-O
                     | 
                    UNIVERSITY "7-42" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-94620-8-O
                     | 
                    UNIVERSITY "7-42" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-94621-8-O
                     | 
                    UNIVERSITY "7-42" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-94622-8-O
                     | 
                    UNIVERSITY "7-42" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-99852-8-O
                     | 
                    UNIVERSITY "7-42" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-99853-8-O
                     | 
                    UNIVERSITY "7-42" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-724490-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-765391-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9098660-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9150350-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9150440-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9151720-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9151730-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9232390-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9232400-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9278310-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9278320-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9298390-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9298400-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9331540-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9363900-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9363930-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-98900-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-98901-8-O
                     | 
                    UNIVERSITY "7-43" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-38632-8-O
                     | 
                    UNIVERSITY "7-6" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        7
                     | 
                
                
                    | 
                        P-9151200-8-O
                     | 
                    UNIVERSITY "7-6" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9151460-8-O
                     | 
                    UNIVERSITY "7-6" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-94695-8-O
                     | 
                    UNIVERSITY "7-6" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-98907-8-O
                     | 
                    UNIVERSITY "7-6" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-38630-8-O
                     | 
                    UNIVERSITY "7-8" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        5
                     | 
                
                
                    | 
                        P-9017300-8-O
                     | 
                    UNIVERSITY "7-8" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9205600-8-O
                     | 
                    UNIVERSITY "7-8" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9205610-8-O
                     | 
                    UNIVERSITY "7-8" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9206590-8-O
                     | 
                    UNIVERSITY "7-8" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9206620-8-O
                     | 
                    UNIVERSITY "7-8" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9206630-8-O
                     | 
                    UNIVERSITY "7-8" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-39061-8-O
                     | 
                    UNIVERSITY "7-9" | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        10
                     | 
                
                
                    | 
                        P-9151080-8-O
                     | 
                    UNIVERSITY "7-9" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9202610-8-O
                     | 
                    UNIVERSITY "7-9" | 
                    
                        LOWE (ATOKA) (55256030)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9235400-8-O
                     | 
                    UNIVERSITY "7-9" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9235420-8-O
                     | 
                    UNIVERSITY "7-9" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9245420-8-O
                     | 
                    UNIVERSITY "7-9" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9267090-8-O
                     | 
                    UNIVERSITY "7-9" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-9363910-8-O
                     | 
                    UNIVERSITY "7-9" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-99458-8-O
                     | 
                    UNIVERSITY "7-9" | 
                    
                        BREEDLOVE (STRAWN) (11751400)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-3713-7C-O
                     | 
                    UNIVERSITY "8" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        8
                     | 
                
                
                    | 
                        R-16575-7C-O
                     | 
                    UNIVERSITY "8B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        R-9504-7C-O
                     | 
                    UNIVERSITY "9" | 
                    
                        BENEDUM (SPRABERRY) (7109875)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-18323-7C-O
                     | 
                    UNIVERSITY "9-11" | 
                    
                        LIN (WOLFCAMP) (53613750)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-17675-7C-O
                     | 
                    UNIVERSITY "9-2" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-265635-7C-G
                     | 
                    UNIVERSITY "AA" | 
                    
                        TEXON (FUSSELMAN GAS) (89193750)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-9659-7C-O
                     | 
                    UNIVERSITY "AA" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-140260-7C-G
                     | 
                    UNIVERSITY "E" | 
                    
                        BAKER RANCH (CANYON) (5143300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21060-7C-O
                     | 
                    UNIVERSITY "E2-34A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21058-7C-O
                     | 
                    UNIVERSITY "E2-34B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21010-7C-O
                     | 
                    UNIVERSITY "E2-34C" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21007-7C-O
                     | 
                    UNIVERSITY "E2-34D" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21048-7C-O
                     | 
                    UNIVERSITY "E2-34E" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21001-7C-O
                     | 
                    UNIVERSITY "E2-34F" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-20832-7C-O
                     | 
                    UNIVERSITY "W3-169A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-20920-7C-O
                     | 
                    UNIVERSITY "W3-169B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-849088-7C-O
                     | 
                    UNIVERSITY "W3-169C" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-20858-7C-O
                     | 
                    UNIVERSITY "W3-169D" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-20861-7C-O
                     | 
                    UNIVERSITY "W3-169E" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21338-7C-O
                     | 
                    UNIVERSITY 10-11A | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21339-7C-O
                     | 
                    UNIVERSITY 10-11B | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21299-7C-O
                     | 
                    UNIVERSITY 10-11C | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21591-7C-O
                     | 
                    UNIVERSITY 10-17D | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21597-7C-O
                     | 
                    UNIVERSITY 10-17E | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21594-7C-O
                     | 
                    UNIVERSITY 10-17F | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-883000-7C-O
                     | 
                    UNIVERSITY 10-8A | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-883001-7C-O
                     | 
                    UNIVERSITY 10-8B | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-883002-7C-O
                     | 
                    UNIVERSITY 10-8C | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16811-7C-O
                     | 
                    UNIVERSITY 12-3 | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16296-7C-O
                     | 
                    UNIVERSITY 1-32 | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        28
                     | 
                
                
                    | 
                        P-872694-7C-O
                     | 
                    UNIVERSITY 1-32 | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-16764-7C-O
                     | 
                    UNIVERSITY 1-4 | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-12144-7C-O
                     | 
                    UNIVERSITY 15 "A" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-12145-7C-O
                     | 
                    UNIVERSITY 15 "B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-11280-7C-O
                     | 
                    UNIVERSITY 16 "B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-11283-7C-O
                     | 
                    UNIVERSITY 16 "C" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-907410-7C-O
                     | 
                    UNIVERSITY 2-20 | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-906519-7C-O
                     | 
                    UNIVERSITY 2-28 | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-910597-7C-O
                     | 
                    UNIVERSITY 2-30P | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-910598-7C-O
                     | 
                    UNIVERSITY 2-30Q | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-910599-7C-O
                     | 
                    UNIVERSITY 2-30R | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-910600-7C-O
                     | 
                    UNIVERSITY 2-30S | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-910601-7C-O
                     | 
                    UNIVERSITY 2-30T | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-906520-7C-O
                     | 
                    UNIVERSITY 2-33 | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22902-7C-O
                     | 
                    UNIVERSITY 3-12A | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22903-7C-O
                     | 
                    UNIVERSITY 3-12B | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22925-7C-O
                     | 
                    UNIVERSITY 3-12C | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22926-7C-O
                     | 
                    UNIVERSITY 3-12D | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22924-7C-O
                     | 
                    UNIVERSITY 3-12E | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23106-7C-O
                     | 
                    UNIVERSITY 3-14A | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23074-7C-O
                     | 
                    UNIVERSITY 3-14B | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23073-7C-O
                     | 
                    UNIVERSITY 3-14C | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-17382-7C-O
                     | 
                    UNIVERSITY 3-19 | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-17382-7C-O
                     | 
                    UNIVERSITY 3-19 | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        47
                     | 
                
                
                    | 
                        R-21651-7C-O
                     | 
                    UNIVERSITY 4-7D | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21668-7C-O
                     | 
                    UNIVERSITY 4-7E | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21652-7C-O
                     | 
                    UNIVERSITY 4-7F | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23284-7C-O
                     | 
                    UNIVERSITY 58-17A | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-906636-7C-O
                     | 
                    UNIVERSITY 58-17B | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23255-7C-O
                     | 
                    UNIVERSITY 58-17C | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23279-7C-O
                     | 
                    UNIVERSITY 58-17D | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-906639-7C-O
                     | 
                    UNIVERSITY 58-17E | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23290-7C-O
                     | 
                    UNIVERSITY 58-17F | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23298-7C-O
                     | 
                    UNIVERSITY 58-17H | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-906627-7C-O
                     | 
                    UNIVERSITY 58-17I | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23283-7C-O
                     | 
                    UNIVERSITY 58-17J | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23297-7C-O
                     | 
                    UNIVERSITY 58-17K | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23296-7C-O
                     | 
                    UNIVERSITY 58-17L | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-906633-7C-O
                     | 
                    UNIVERSITY 58-17M | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-38729-8-O
                     | 
                    UNIVERSITY 6-26 | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58726-8-O
                     | 
                    UNIVERSITY 6-48A | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58587-8-O
                     | 
                    UNIVERSITY 6-48B | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58724-8-O
                     | 
                    UNIVERSITY 6-48C | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58588-8-O
                     | 
                    UNIVERSITY 6-48D | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58709-8-O
                     | 
                    UNIVERSITY 6-48E | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-53874-8-O
                     | 
                    UNIVERSITY 6C | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-53979-8-O
                     | 
                    UNIVERSITY 6D | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54225-8-O
                     | 
                    UNIVERSITY 6E | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-53857-8-O
                     | 
                    UNIVERSITY 6F | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54049-8-O
                     | 
                    UNIVERSITY 6G | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-53943-8-O
                     | 
                    UNIVERSITY 6H | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54026-8-O
                     | 
                    UNIVERSITY 6I | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54148-8-O
                     | 
                    UNIVERSITY 6J | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54242-8-O
                     | 
                    UNIVERSITY 6K | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-56452-8-O
                     | 
                    UNIVERSITY 7-14A | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-56315-8-O
                     | 
                    UNIVERSITY 7-14B | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-56338-8-O
                     | 
                    UNIVERSITY 7-14C | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-56316-8-O
                     | 
                    UNIVERSITY 7-14D | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-861811-8-O
                     | 
                    UNIVERSITY 7-14D | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-56393-8-O
                     | 
                    UNIVERSITY 7-14E | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-56256-8-O
                     | 
                    UNIVERSITY 7-14F | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-59984-8-O
                     | 
                    UNIVERSITY 7-14G | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-886599-8-O
                     | 
                    UNIVERSITY 7-14GG | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-886394-8-O
                     | 
                    UNIVERSITY 7-14H | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-886616-8-O
                     | 
                    UNIVERSITY 7-14HH | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-886395-8-O
                     | 
                    UNIVERSITY 7-14I | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-60290-8-O
                     | 
                    UNIVERSITY 7-14II | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-886396-8-O
                     | 
                    UNIVERSITY 7-14J | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-886614-8-O
                     | 
                    UNIVERSITY 7-14JJ | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-886397-8-O
                     | 
                    UNIVERSITY 7-14K | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-60090-8-O
                     | 
                    UNIVERSITY 7-14KK | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-886398-8-O
                     | 
                    UNIVERSITY 7-14L | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-60088-8-O
                     | 
                    UNIVERSITY 7-14LL | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58475-8-O
                     | 
                    UNIVERSITY 7-20A | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58494-8-O
                     | 
                    UNIVERSITY 7-20B | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58694-8-O
                     | 
                    UNIVERSITY 7-20C | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58693-8-O
                     | 
                    UNIVERSITY 7-20D | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-58753-8-O
                     | 
                    UNIVERSITY 7-20E | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-59082-8-O
                     | 
                    UNIVERSITY 7-20F | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-875280-8-O
                     | 
                    UNIVERSITY 7-20F | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-51198-8-O
                     | 
                    UNIVERSITY 7-28 PU | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        6
                     | 
                
                
                    | 
                        P-895193-8-O
                     | 
                    UNIVERSITY 7-28 PU | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-895194-8-O
                     | 
                    UNIVERSITY 7-28 PU | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-895195-8-O
                     | 
                    UNIVERSITY 7-28 PU | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-895197-8-O
                     | 
                    UNIVERSITY 7-28 PU | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-895199-8-O
                     | 
                    UNIVERSITY 7-28 PU | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-41344-8-O
                     | 
                    UNIVERSITY 7-39A | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        4
                     | 
                
                
                    | 
                        R-40532-8-O
                     | 
                    UNIVERSITY 7-43 | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        113
                     | 
                
                
                    | 
                        P-885558-8-O
                     | 
                    UNIVERSITY 7-43 | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-885559-8-O
                     | 
                    UNIVERSITY 7-43 | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-885560-8-O
                     | 
                    UNIVERSITY 7-43 | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54269-8-O
                     | 
                    UNIVERSITY 7-7A | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54361-8-O
                     | 
                    UNIVERSITY 7-7B | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54266-8-O
                     | 
                    UNIVERSITY 7-7C | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54018-8-O
                     | 
                    UNIVERSITY 7-8F | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54057-8-O
                     | 
                    UNIVERSITY 7-8G | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-54308-8-O
                     | 
                    UNIVERSITY 7-8H | 
                    
                        SPRABERRY (TREND AREA) (08) (85280300)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21649-7C-O
                     | 
                    UNIVERSITY E2-30A | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21639-7C-O
                     | 
                    UNIVERSITY E2-30B | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21600-7C-O
                     | 
                    UNIVERSITY E2-30C | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21636-7C-O
                     | 
                    UNIVERSITY E2-30D | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22631-7C-O
                     | 
                    UNIVERSITY E2-30E | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22722-7C-O
                     | 
                    UNIVERSITY E2-30F | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22639-7C-O
                     | 
                    UNIVERSITY E2-30G | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22721-7C-O
                     | 
                    UNIVERSITY E2-30H | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22667-7C-O
                     | 
                    UNIVERSITY E2-30I | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22666-7C-O
                     | 
                    UNIVERSITY E2-30J | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-4626-7C-O
                     | 
                    UNIVERSITY LONGHORN "28-B" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-21691-7C-O
                     | 
                    UNIVERSITY W2-30A | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21704-7C-O
                     | 
                    UNIVERSITY W2-30B | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21705-7C-O
                     | 
                    UNIVERSITY W2-30C | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21577-7C-O
                     | 
                    UNIVERSITY W2-30D | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21348-7C-O
                     | 
                    UNIVERSITY W2-34A | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-23149-7C-O
                     | 
                    UNIVERSITY W2-34B | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21355-7C-O
                     | 
                    UNIVERSITY W2-34C | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21291-7C-O
                     | 
                    UNIVERSITY W2-34D | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21292-7C-O
                     | 
                    UNIVERSITY W2-34E | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21362-7C-O
                     | 
                    UNIVERSITY W2-34F | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21369-7C-O
                     | 
                    UNIVERSITY W2-34G | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-4324-7C-O
                     | 
                    UNIVERSITY WHITE "6" | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        2
                     | 
                
                
                    | 
                        R-22106-7C-O
                     | 
                    UNIVERSITY-RATLIFF E58-7G | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22107-7C-O
                     | 
                    UNIVERSITY-RATLIFF E58-7H | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22108-7C-O
                     | 
                    UNIVERSITY-RATLIFF E58-7I | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22109-7C-O
                     | 
                    UNIVERSITY-RATLIFF E58-7J | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-22110-7C-O
                     | 
                    UNIVERSITY-RATLIFF E58-7K | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21445-7C-O
                     | 
                    UNIVERSITY-RATLIFF W58-7A | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21429-7C-O
                     | 
                    UNIVERSITY-RATLIFF W58-7B | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-867518-7C-O
                     | 
                    UNIVERSITY-RATLIFF W58-7C | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21434-7C-O
                     | 
                    UNIVERSITY-RATLIFF W58-7D | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21430-7C-O
                     | 
                    UNIVERSITY-RATLIFF W58-7E | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-21455-7C-O
                     | 
                    UNIVERSITY-RATLIFF W58-7F | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        R-12918-7C-O
                     | 
                    UNIVERSITY-WHITE | 
                    
                        SPRABERRY (TREND AREA) (7C) (85279200)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-840621-8-O
                     | 
                    UTL "1308A-17" | 
                    
                        PHANTOM (WOLFCAMP) (71052900)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-840622-8-O
                     | 
                    UTL "1308A-17" | 
                    
                        PHANTOM (WOLFCAMP) (71052900)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-840625-8-O
                     | 
                    UTL "1308B-17" | 
                    
                        PHANTOM (WOLFCAMP) (71052900)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     | 
                
                
                    | 
                        P-840665-8-O
                     | 
                    UTL "1308B-17" | 
                    
                        PHANTOM (WOLFCAMP) (71052900)
                     | 
                    
                        PIONEER NATURAL RES. USA, INC. (0000665748) | 
                    
                        1
                     |