| 476869 | Jun 10, 1998 | Jun 10, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "31" #107R37531586 | 2,500 |
| 476631 | Jun 2, 1998 | Jun 2, 1998 | Pioneer Natural Res. USA, Inc. | Crawford "24" #14R37531582 | 2,500 |
| 476631Amendment | Jun 2, 1998 | Jun 2, 1998 | Pioneer Natural Res. USA, Inc. | Crawford "24" #14R37531582 | 2,500 |
| 476634 | Jun 1, 1998 | Jun 1, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "71" #148R37531579 | 2,500 |
| 476633 | Jun 1, 1998 | Jun 1, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "81" #141R37531580 | 2,500 |
| 476632 | Jun 1, 1998 | Jun 1, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "10" #136R37531581 | 2,500 |
| 476630 | Jun 1, 1998 | Jun 1, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "12" #A23037531583 | 3,300 |
| 476630Amendment | Jun 1, 1998 | Jun 1, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "12" #A23037531583 | 3,300 |
| 476630Amendment | Jun 1, 1998 | Jun 1, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "12" #A23037531583 | 3,300 |
| 476369 | May 21, 1998 | May 21, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "40" #103R37531578 | 2,100 |
| 475943 | May 8, 1998 | May 8, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "24" #147R37531569 | 2,200 |
| 475942 | May 8, 1998 | May 8, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "15" #144R37531570 | 2,300 |
| 475941 | May 8, 1998 | May 8, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "17" #143R37531571 | 2,200 |
| 475940 | May 8, 1998 | May 8, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "20" #140R37531572 | 2,100 |
| 475939 | May 8, 1998 | May 8, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "22" #133R37531573 | 2,200 |
| 475938 | May 8, 1998 | May 8, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "82" #131R37531574 | 2,300 |
| 475937 | May 8, 1998 | May 8, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "67" #130R37531575 | 2,300 |
| 475935 | May 8, 1998 | May 8, 1998 | Pioneer Natural Res. USA, Inc. | Gage "8" #3R37531576 | 2,300 |
| 475933 | May 8, 1998 | May 8, 1998 | Pioneer Natural Res. USA, Inc. | Crawford "4" #13R37531577 | 2,400 |
| 475934 | May 4, 1998 | May 4, 1998 | Sunlight Exploration, Inc. | Marsh Ranch #304837531568 | 4,000 |
| 475634 | Apr 30, 1998 | Apr 30, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "21" #101R37531567 | 2,500 |
| 475633 | Apr 30, 1998 | Apr 30, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "12" #106R37531566 | 2,500 |
| 475632 | Apr 30, 1998 | Apr 30, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "9" #108R37531565 | 2,500 |
| 475631 | Apr 30, 1998 | Apr 30, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "30" #109R37531564 | 2,400 |
| 475630 | Apr 28, 1998 | Apr 28, 1998 | Pioneer Natural Res. USA, Inc. | Coughlin #4R37531563 | 2,400 |
| 473916 | Apr 20, 1998 | Apr 20, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "72" #135R37531562 | 2,400 |
| 473819 | Mar 10, 1998 | Mar 10, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "104" #129R37531560 | 2,000 |
| 473919 | Mar 6, 1998 | Mar 6, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "91" #127R37531561 | 2,300 |
| 473820 | Mar 6, 1998 | Mar 6, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "104" #146R37531559 | 2,000 |
| 473732 | Mar 6, 1998 | Mar 6, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "100" #138R37531556 | 2,300 |
| 473731 | Mar 6, 1998 | Mar 6, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "93" #145R37531557 | 2,400 |
| 473730 | Mar 6, 1998 | Mar 6, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "64" #128R37531558 | 2,200 |
| 473729 | Mar 6, 1998 | Mar 6, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "71" #132R37531555 | 2,300 |
| 473522 | Mar 6, 1998 | Mar 6, 1998 | Seagull Midcon Inc. | Bivins #A 837500209 | 3,002 |
| 473520 | Mar 5, 1998 | Mar 5, 1998 | Seagull Midcon Inc. | Bivins #A 737500229 | 2,980 |
| 473818 | Feb 27, 1998 | Feb 27, 1998 | J. W. Resources Inc. | Bivins Ranch "C" #300137531471 | 2,900 |
| 473675 | Feb 27, 1998 | Feb 27, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "70" #139R37531554 | 2,300 |
| 473625 | Feb 24, 1998 | Feb 24, 1998 | J. W. Resources Inc. | Bivins Ranch "B" #200337531474 | 2,900 |
| 472827 | Jan 30, 1998 | Jan 30, 1998 | Sunlight Exploration, Inc. | Marsh Ranch #204837531445 | 4,000 |
| 472793 | Jan 30, 1998 | Jan 30, 1998 | Seagull Midcon Inc. | Bivins a 2 #A 237580202 | 2,953 |
| 472451 | Jan 28, 1998 | Jan 28, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "109" #126R37531552 | 2,000 |
| 472450 | Jan 28, 1998 | Jan 28, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "92" #121R37531551 | 2,300 |
| 472442 | Jan 28, 1998 | Jan 28, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "65" #122R37531550 | 2,200 |
| 472448 | Jan 23, 1998 | Jan 23, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "101" #123R37531549 | 2,200 |
| 472446 | Jan 23, 1998 | Jan 23, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "86" #124R37531548 | 2,400 |
| 472444 | Jan 23, 1998 | Jan 23, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "22" #100R37531547 | 2,400 |
| 472351 | Jan 23, 1998 | Jan 23, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "35" #B11337531545 | 3,100 |
| 472349 | Jan 23, 1998 | Jan 23, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "11" #98R37531546 | 2,400 |
| 472443 | Jan 22, 1998 | Jan 22, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "2" #99R37531553 | 2,400 |
| 472443Amendment | Jan 22, 1998 | Jan 22, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "2" #99R37531553 | 4,250 |
| 472252 | Jan 22, 1998 | Jan 22, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "105" #B12637531543 | 3,400 |
| 472253 | Jan 20, 1998 | Jan 20, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "4" #B12537531544 | 3,300 |
| 472158 | Jan 16, 1998 | Jan 16, 1998 | Pioneer Natural Res. USA, Inc. | Masterson "83" #J 1337531542 | 3,400 |
| 471888 | Jan 14, 1998 | Jan 14, 1998 | Pioneer Natural Res. USA, Inc. | Bivins "23" #A22937531541 | 3,600 |
| 471792 | Jan 12, 1998 | Jan 12, 1998 | J. W. Resources Inc. | Bivins Ranch "A" #200437531540 | 2,750 |
| 471679 | Dec 30, 1997 | Dec 30, 1997 | Pioneer Natural Res. USA, Inc. | Warrick #A 1037531539 | 3,100 |
| 470856 | Dec 5, 1997 | Dec 5, 1997 | Sunlight Exploration, Inc. | Marsh Ranch #14837531495 | 3,905 |
| 469665 | Nov 4, 1997 | Nov 4, 1997 | HS Resources, Inc. | Bivins Ranch #221137531537 | 9,500 |
| 469664 | Nov 4, 1997 | Nov 4, 1997 | HS Resources, Inc. | Bivins Ranch #110337531538 | 9,500 |
| 468338 | Oct 2, 1997 | Oct 2, 1997 | Gould Oil Inc. | Masterson #741237531625 | 2,350 |
| 463448 | Jun 18, 1997 | Jun 18, 1997 | Mesa Operating Co. | Masterson "62" #A 4637531535 | 3,450 |
| 463580 | Jun 12, 1997 | Jun 12, 1997 | J. W. Resources Inc. | Bivins Ranch #200237531475 | 2,900 |
| 463357 | Jun 11, 1997 | Jun 11, 1997 | Mesa Operating Co. | Crawford "68" #B 537531534 | 3,350 |
| 462753 | Jun 9, 1997 | Jun 9, 1997 | Mesa Operating Co. | Crawford "80" #12R37531532 | 2,325 |
| 462749 | May 30, 1997 | May 30, 1997 | Mesa Operating Co. | Bivins "30" #97R37531530 | 2,350 |
| 462438 | May 30, 1997 | May 30, 1997 | Mesa Operating Co. | Masterson "35" #B12337531529 | 3,086 |
| 462438Amendment | May 30, 1997 | May 30, 1997 | Pioneer Natural Res. USA, Inc. | Masterson #B12337531529 | 3,086 |
| 462754 | May 28, 1997 | May 28, 1997 | Mesa Operating Co. | Masterson "89" #B12437531533 | 3,300 |
| 462752 | May 28, 1997 | May 28, 1997 | Mesa Operating Co. | Crawford "78" #11R37531531 | 2,400 |
| 461617 | Apr 30, 1997 | Apr 30, 1997 | Mesa Operating Co. | Masterson "66" #118R37531527 | 2,210 |
| 461618 | Apr 29, 1997 | Apr 29, 1997 | Mesa Operating Co. | Masterson "95" #117R37531528 | 2,120 |
| 461521 | Apr 29, 1997 | Apr 29, 1997 | Mesa Operating Co. | Masterson "99" #115R37531526 | 2,150 |
| 461522 | Apr 25, 1997 | Apr 25, 1997 | Mesa Operating Co. | Masterson "23" #116R37531525 | 2,100 |
| 461433 | Apr 25, 1997 | Apr 25, 1997 | Mesa Operating Co. | Crawford #9R37531524 | 2,500 |
| 461432 | Apr 25, 1997 | Apr 25, 1997 | Mesa Operating Co. | Masterson "90" #114R37531523 | 2,150 |
| 461143 | Apr 23, 1997 | Apr 23, 1997 | Mesa Operating Co. | Masterson "79" #112R37531521 | 2,450 |
| 461142 | Apr 23, 1997 | Apr 23, 1997 | Mesa Operating Co. | Masterson "94" #111R37531522 | 2,160 |
| 461144 | Apr 18, 1997 | Apr 18, 1997 | Mesa Operating Co. | Masterson "34" #113R37531520 | 2,100 |
| 461085 | Apr 16, 1997 | Apr 16, 1997 | Mesa Operating Co. | Coughlin #3R37531519 | 2,400 |
| 461084 | Apr 16, 1997 | Apr 16, 1997 | Mesa Operating Co. | Masterson "3" #110R37531518 | 2,400 |
| 460487 | Apr 2, 1997 | Apr 2, 1997 | Mesa Operating Co. | Masterson "105" #119R37531517 | 1,800 |
| 460485 | Apr 2, 1997 | Apr 2, 1997 | Mesa Operating Co. | Crawford #10R37531516 | 2,400 |
| 460412 | Mar 31, 1997 | Mar 31, 1997 | Mesa Operating Co. | Bivins "10" #96R37531515 | 2,400 |
| 460140 | Mar 25, 1997 | Mar 25, 1997 | Mesa Operating Co. | Masterson "100" #B12137531514 | 3,400 |
| 460018 | Mar 24, 1997 | Mar 24, 1997 | Mesa Operating Co. | McBride #A 337531513 | 6,600 |
| 460017 | Mar 24, 1997 | Mar 24, 1997 | Mesa Operating Co. | Bivins #A20637531512 | 6,000 |
| 457588 | Jan 27, 1997 | Jan 27, 1997 | Mesa Operating Co. | Masterson "90" #B11937531510 | 3,300 |
| 457583 | Jan 27, 1997 | Jan 27, 1997 | Mesa Operating Co. | Masterson "92" #B12037531511 | 3,400 |
| 457534 | Jan 22, 1997 | Jan 22, 1997 | Mesa Operating Co. | Masterson "102" #C 437531509 | 3,400 |
| 457448 | Jan 22, 1997 | Jan 22, 1997 | Mesa Operating Co. | Masterson "94" #A 4737531508 | 3,400 |
| 455329 | Jan 19, 1997 | Jan 19, 1997 | Burnett Corp. | Summers #1 #137580192 | 2,937 |
| 457363 | Jan 17, 1997 | Jan 17, 1997 | Mesa Operating Co. | Masterson "64" #B11437531507 | 3,400 |
| 457218 | Jan 17, 1997 | Jan 17, 1997 | Mesa Operating Co. | Masterson "56" #B11637531506 | 3,200 |
| 457217 | Jan 15, 1997 | Jan 15, 1997 | Mesa Operating Co. | Masterson "65" #B11737531505 | 3,000 |
| 457071 | Jan 9, 1997 | Jan 9, 1997 | Mesa Operating Co. | Bivins "3" #A22137531503 | 3,300 |
| 457070 | Jan 9, 1997 | Jan 9, 1997 | Mesa Operating Co. | Warrick #A 937531504 | 3,100 |
| 457070Amendment | Jan 9, 1997 | Jan 9, 1997 | Mesa Operating Co. | Warrick #A 937531504 | 3,100 |
| 456936 | Jan 7, 1997 | Jan 7, 1997 | Mesa Operating Co. | Masterson "84" #A4837531502 | 3,400 |
| 456935 | Jan 7, 1997 | Jan 7, 1997 | Mesa Operating Co. | Masterson "79" #G737531501 | 3,500 |
| 456610 | Jan 6, 1997 | Jan 6, 1997 | Mesa Operating Co. | Masterson "72" #B11237531500 | 3,600 |