| 494031 | Apr 13, 2000 | Apr 13, 2000 | Union Pacific Resources Company | Milam Unit #1REH | 9,000 | 04130868 |
| 493827 | Apr 6, 2000 | Apr 6, 2000 | B.W.O.C., Inc. | Perkins - Yager #3HH | 8,900 | 04130772 |
| 493015 | Mar 13, 2000 | Mar 13, 2000 | Cody Energy LLC | Kurten Woodbine Unit #4058 | 8,800 | 04131924 |
| 492898 | Mar 9, 2000 | Mar 9, 2000 | Cody Energy LLC | Kurten Woodbine Unit #4041 | 8,800 | 04131923 |
| 492629 | Mar 2, 2000 | Mar 2, 2000 | Chesapeake Operating, Inc. | Allen Farms #2HH | 16,500 | 04131885 |
| 491995 | Feb 15, 2000 | Feb 15, 2000 | Northfield Enterprises, Inc. | JB #1H | 8,000 | 04131560 |
| 491995 | Feb 15, 2000 | Feb 15, 2000 | Northfield Enterprises, Inc. | JB #1H | 8,000 | 04131560 |
| 491995 | Feb 15, 2000 | Feb 15, 2000 | Northfield Enterprises, Inc. | JB #1H | 8,500 | 04131560 |
| 491893 | Feb 9, 2000 | Feb 9, 2000 | Union Pacific Resources Company | Bush-Stetz #1REH | 15,000 | 04131601 |
| 491893 | Feb 9, 2000 | Feb 9, 2000 | Union Pacific Resources Company | Bush-Stetz #1REH | 15,000 | 04131601 |
| 491050 | Jan 13, 2000 | Jan 13, 2000 | Union Pacific Resources Company | Berger-Porterfield #1REH | 15,000 | 04131571 |
| 491050 | Jan 13, 2000 | Jan 13, 2000 | Union Pacific Resources Company | Berger-Porterfield #1REH | 15,000 | 04131571 |
| 490503 | Dec 30, 1999 | Dec 30, 1999 | Ogden Resources Corporation | Six Shooter #5 | 3,950 | 04131922 |
| 490621 | Dec 22, 1999 | Dec 22, 1999 | B.W.O.C., Inc. | Bryan (Austin Chalk) Pooled Unit #67HH | 8,900 | 04130647 |
| 490463 | Dec 17, 1999 | Dec 17, 1999 | B.W.O.C., Inc. | Bryan Austin Chalk Pooled Unit #8HH | 9,500 | 04130891 |
| 490446 | Dec 17, 1999 | Dec 17, 1999 | Emerald Operating Company, Inc. | Lometa #1H | 12,000 | 04131747 |
| 490121 | Dec 7, 1999 | Dec 7, 1999 | Ogden Resources Corporation | Six Shooter #4 | 3,750 | 04131921 |
| 489799 | Nov 23, 1999 | Nov 23, 1999 | B.W.O.C., Inc. | Bryan (Austin Chalk) Polled Unit #23HH | 9,000 | 04130863 |
| 489198 | Nov 5, 1999 | Nov 5, 1999 | B.W.O.C., Inc. | Bryan (Austin Chalk) Pooled Unit #17HH | 9,100 | 04130921 |
| 488933 | Oct 28, 1999 | Oct 28, 1999 | Union Pacific Resources Company | Stetz-Rancho Grande Unit #1H | 9,300 | 04131716 |
| 488933 | Oct 28, 1999 | Oct 28, 1999 | Union Pacific Resources Company | Stetz-Rancho Grande #1REH | 14,000 | 04131716 |
| 488875 | Oct 26, 1999 | Oct 26, 1999 | Chesapeake Operating, Inc. | Walton OL #1HH | 16,500 | 04131847 |
| 488792 | Oct 25, 1999 | Oct 25, 1999 | Koch Pipeline Company, L.P. | Rectifier #C585 | 250 | 04131920 |
| 488710 | Oct 20, 1999 | Oct 20, 1999 | B.W.O.C., Inc. | Bryan(austin Chalk) Pooled Unit #15HH | 9,600 | 04130925 |
| 486557 | Sep 8, 1999 | Sep 8, 1999 | Ginger Petroleum Company, Inc. | Curtis-Patranella #1H | 10,500 | 04131324 |
| 487302 | Sep 7, 1999 | Sep 7, 1999 | B.W.O.C., Inc. | Bryan (Austin Chalk) Pooled Unit #39HH | 8,900 | 04130760 |
| 487301 | Sep 7, 1999 | Sep 7, 1999 | B.W.O.C., Inc. | Bryan (Austin Chalk) Pooled Unit #29HH | 9,200 | 04130808 |
| 487063 | Aug 27, 1999 | Aug 27, 1999 | 7711 Corporation, The | Higgins #1H | 10,477 | 04131683 |
| 486733 | Aug 18, 1999 | Aug 18, 1999 | Union Pacific Resources Company | Jones-Foster Unit #1REH | 14,000 | 04131723 |
| 486526 | Aug 9, 1999 | Aug 9, 1999 | Howell Petroleum Corporation | Varisco Estate #2 | 7,761 | 04131204 |
| 486269 | Jul 30, 1999 | Jul 30, 1999 | B.W.O.C., Inc. | Bryan (Austin Chalk) Pooled Unit #67HH | 8,700 | 04130647 |
| 486268 | Jul 30, 1999 | Jul 30, 1999 | B.W.O.C., Inc. | Bryan (Austin Chalk) Pooled Unit #10HH | 9,000 | 04130875 |
| 485888 | Jul 15, 1999 | Jul 15, 1999 | Grand Operating, Inc. | Lyons Unit #2HH | 11,500 | 04131842 |
| 485284 | Jun 17, 1999 | Jun 17, 1999 | Union Pacific Resources Company | Lenz Unit #1REH | 14,000 | 04131580 |
| 484849 | May 28, 1999 | May 28, 1999 | Union Pacific Resources Company | Brazos Coal Ltd.-Terry "B" Unit #1REH | 12,000 | 04131729 |
| 484654 | May 20, 1999 | May 20, 1999 | Union Pacific Resources Company | Weedon-Weedon B #1REH | 10,750 | 04131646 |
| 484654 | May 20, 1999 | May 20, 1999 | Union Pacific Resources Company | Weedon-Weedon B #1REH | 11,000 | 04131646 |
| 483898 | Apr 15, 1999 | Apr 15, 1999 | Howell Petroleum Corporation | Newberry #3 | 7,685 | 04131361 |
| 482955 | Feb 25, 1999 | Feb 25, 1999 | Grand Operating, Inc. | Nantucket #1H | 11,000 | 04131771 |
| 482767 | Feb 18, 1999 | Feb 18, 1999 | Union Pacific Resources Company | Woolum-Holligan Unit #1REH | 15,000 | 04131540 |
| 482346 | Feb 17, 1999 | Feb 17, 1999 | Escopeta Production Company | Gerke #1H | 9,000 | 04130616 |
| 482533 | Feb 8, 1999 | Feb 8, 1999 | Union Pacific Resources Company | Wheeler-Wheeler "a" Unit #1REH | 11,000 | 04131619 |
| 480743 | Nov 9, 1998 | Nov 9, 1998 | Union Pacific Resources Company | Fickey-Lard (Buda) Unit #1REH | 13,800 | 04131666 |
| 480660 | Nov 5, 1998 | Nov 5, 1998 | Union Pacific Resources Company | Sitka Unit #1H | 8,000 | 39530577 |
| 478972 | Aug 31, 1998 | Aug 31, 1998 | Cody Energy, Inc. | Kurten Woodbine Unit #3621 | 8,900 | 04130459 |
| 477635 | Jul 7, 1998 | Jul 7, 1998 | Union Pacific Resources Company | Oliver F. Goen Unit #1H | 11,500 | 04131653 |
| 475335 | Apr 15, 1998 | Apr 15, 1998 | Union Pacific Resources Company | J. E. Weedon Unit #2REH | 13,200 | 04131508 |
| 474566 | Mar 26, 1998 | Mar 26, 1998 | Union Pacific Resources Company | Fuente Unit #1H | 11,800 | 04131918 |
| 472899 | Mar 26, 1998 | Mar 26, 1998 | Union Pacific Resources Company | Steephollow Unit #1H | 12,500 | 04131916 |
| 472899 | Mar 2, 1998 | Mar 2, 1998 | Union Pacific Resources Company | Steephollow Unit #1H | 12,500 | 04131916 |
| 472899 | Mar 2, 1998 | Mar 2, 1998 | Union Pacific Resources Company | Steephollow Unit #1H | 12,500 | 04131916 |
| 472984 | Feb 5, 1998 | Feb 5, 1998 | Vaalco Energy (USA), Inc. - | Stevener #1HH | 8,500 | 04131917 |
| 471608 | Dec 23, 1997 | Dec 23, 1997 | Hunter Petroleum Inc. | Franze, R. F. #1H | 8,900 | 04131012 |
| 471608 | Dec 23, 1997 | Dec 23, 1997 | Hunter Petroleum Inc. | Franze, R. F. #1H | 8,900 | 04131012 |
| 470826 | Dec 23, 1997 | Dec 23, 1997 | Shoreham Oil & Gas Company, Inc. | Garrett - Kyle #1 | 2,500 | 04131913 |
| 470891 | Dec 19, 1997 | Dec 19, 1997 | RO-JO, Inc. | Christopher #3 #3 | 7,978 | 04131527 |
| 471434 | Dec 18, 1997 | Dec 18, 1997 | Patterson Petroleum, Inc. | Mitchem Unit #1 | 9,500 | 04130848 |
| 471003 | Dec 9, 1997 | Dec 9, 1997 | Union Pacific Resources Company | Schadenfreude Unit #1H | 14,800 | 04131914 |
| 469848 | Dec 2, 1997 | Dec 2, 1997 | 7711 Corporation, The | Seale Ranch Unit "A" #2HH | 8,400 | 04131912 |
| 470561 | Nov 25, 1997 | Nov 25, 1997 | Union Pacific Resources Company | Dansby "A" #4H | 8,900 | 04131118 |
| 470561 | Nov 25, 1997 | Nov 25, 1997 | Union Pacific Resources Company | Dansby "A" #4H | 8,900 | 04131118 |
| 469703 | Nov 5, 1997 | Nov 5, 1997 | Belco Operating Corp. | Dickson Lille Mae #1HH | 8,500 | 04131911 |
| 469703 | Nov 5, 1997 | Nov 5, 1997 | Belco Operating Corp. | Dickson, Lillie Mae #1HH | 8,500 | 04131911 |
| 469703 | Nov 5, 1997 | Nov 5, 1997 | Belco Operating Corp. | Dickson, Lillie Mae #1HH | 8,500 | 04131911 |
| 469158 | Oct 28, 1997 | Oct 28, 1997 | Union Pacific Resources Company | Mancuso Unit #2H | 13,945 | 04131839 |
| 468445 | Oct 23, 1997 | Oct 23, 1997 | Westlands Resources Corporation | DRC GA #3H | 9,000 | 04131531 |
| 467934 | Sep 23, 1997 | Sep 23, 1997 | Great West Energy & Expl., Inc. | Traweek #1HH | 8,400 | 04131910 |
| 467278 | Sep 15, 1997 | Sep 15, 1997 | Itech Oil Company | Clear Lake Properties, Inc. #1H | 15,000 | 04131909 |
| 466553 | Aug 21, 1997 | Aug 21, 1997 | Union Pacific Resources Company | Scott-Ruesink Unit #1H | 8,800 | 04131500 |
| 465923 | Aug 7, 1997 | Aug 7, 1997 | 7711 Corporation, The | Burgess-Melberg Unit #1H | 7,777 | 04131908 |
| 465923 | Aug 7, 1997 | Aug 7, 1997 | 7711 Corporation, The | Burgess-Melberg Unit #1H | 7,777 | 04131908 |
| 465756 | Aug 1, 1997 | Aug 1, 1997 | Seneca Resources Corp. | Seneca Fee #1HH | 12,500 | 04131907 |
| 465756 | Aug 1, 1997 | Aug 1, 1997 | Seneca Resources Corp. | Seneca Fee #1HH | 11,771 | 04131907 |
| 464320 | Jul 24, 1997 | Jul 24, 1997 | Union Pacific Resources Company | Dansby "A" #1H | 9,000 | 04131097 |
| 464320 | Jul 24, 1997 | Jul 24, 1997 | Union Pacific Resources Company | Dansby "a" Unit #1H | 9,000 | 04131097 |
| 464327 | Jul 21, 1997 | Jul 21, 1997 | Apache Corporation | Gifford Hill "A" #3 | 7,670 | 04131258 |
| 464332 | Jul 1, 1997 | Jul 1, 1997 | Ogden Resources Corporation | Six Shooter #3 | 3,500 | 04131906 |
| 462801 | Jun 23, 1997 | Jun 23, 1997 | Union Pacific Resources Company | Myers Cattle Unit #3H | 16,200 | 04131903 |
| 463653 | Jun 12, 1997 | Jun 12, 1997 | B.W.O.C., Inc. | B W U #38HH | 8,670 | 04130686 |
| 463653 | Jun 12, 1997 | Jun 12, 1997 | B.W.O.C., Inc. | Bryan (Austin Chalk) Pooled Unit #38HH | 8,900 | 04130686 |
| 463652 | Jun 12, 1997 | Jun 12, 1997 | B.W.O.C., Inc. | B W U #48HH | 8,330 | 04130970 |
| 463652 | Jun 12, 1997 | Jun 12, 1997 | B.W.O.C., Inc. | Bryan (Austin Chalk) Pool Unit #48HH | 8,500 | 04130970 |
| 463281 | Jun 4, 1997 | Jun 4, 1997 | Patterson Petroleum, Inc. | Wickson Unit #1H | 15,000 | 04131905 |
| 463119 | May 30, 1997 | May 30, 1997 | Keystone Exploration, Inc | Bee Creek #1H | 7,975 | 04131904 |
| 461811 | May 28, 1997 | May 28, 1997 | Union Pacific Resources Company | McFarlane #4H | 15,200 | 04131901 |
| 460207 | May 21, 1997 | May 21, 1997 | MW Petroleum Corporation | Varisco, Dorotea Estate "a" Unit #1 | 7,700 | 04131062 |
| 462673 | May 20, 1997 | May 20, 1997 | United Oil & Minerals, Inc. | Goss Trust #1H | 11,000 | 04131902 |
| 462673 | May 20, 1997 | May 20, 1997 | United Oil & Minerals, Inc. | Goss Trust #1H | 14,100 | 04131902 |
| 462343 | May 13, 1997 | May 13, 1997 | B.W.O.C., Inc. | Bwu #29HH | 8,940 | 04130808 |
| 461311 | Apr 24, 1997 | Apr 24, 1997 | Union Pacific Resources Company | Grant #H 1H | 8,900 | 04131900 |
| 461051 | Apr 15, 1997 | Apr 15, 1997 | Union Pacific Resources Company | A&m Easterwood #4H | 19,300 | 04131899 |
| 459784 | Apr 8, 1997 | Apr 8, 1997 | 7711 Corporation, The | Seale Ranch Unit #1HH | 8,777 | 04131898 |
| 460432 | Apr 3, 1997 | Apr 3, 1997 | B.W.O.C., Inc. | Bwu #36HH | 8,700 | 04130825 |
| 460432 | Apr 3, 1997 | Apr 3, 1997 | B.W.O.C., Inc. | Bryan (Austin Chalk) Pooled Unit #36HH | 8,800 | 04130825 |
| 459689 | Mar 12, 1997 | Mar 12, 1997 | Cody Energy, Inc. | Kurten Woodbine Unit #1092 | 8,770 | 04131173 |
| 458443 | Mar 10, 1997 | Mar 10, 1997 | B.W.O.C., Inc. | Bwu #1HH | 9,158 | 04130947 |
| 458696 | Feb 25, 1997 | Feb 25, 1997 | Ginger Petroleum Company, Inc. | Tobola Unit 1-H #1HH | 11,000 | 04131268 |
| 458145 | Feb 3, 1997 | Feb 3, 1997 | Chesapeake Operating, Inc. | Lindley (RE) Unit #1HH | 13,400 | 04131810 |
| 457981 | Jan 29, 1997 | Jan 29, 1997 | WCS Oil and Gas Corporation | Britten #1REH | 9,000 | 04131604 |
| 457739 | Jan 28, 1997 | Jan 28, 1997 | United Oil & Minerals, Inc. | Granberry #1H | 8,500 | 04131897 |