| 518653 | Mar 28, 2002 | Mar 28, 2002 | Southwestern Energy Prod. Co. | Kickapoo Creek Gas Unit 1 #4 | 12,200 | 42331575 |
| 518547 | Mar 28, 2002 | Mar 28, 2002 | Southwestern Energy Prod. Co. | Jerry Cross Gas Unit 1 #1 | 12,500 | 42331574 |
| 518554 | Mar 25, 2002 | Mar 25, 2002 | Southwestern Energy Prod. Co. | Woolf Gas Unit 1 #3 | 12,000 | 42331573 |
| 518554Amendment | Mar 25, 2002 | Mar 25, 2002 | Southwestern Energy Prod. Co. | Woolf Gas Unit 1 #3 | 12,000 | 42331573 |
| 518505 | Mar 22, 2002 | Mar 22, 2002 | Greyfox Energy Partners, L.P. | Jones, Nollie #1 | 7,500 | 42331572 |
| 518173 | Mar 8, 2002 | Mar 8, 2002 | Southwestern Energy Prod. Co. | Milton Anderson Gas Unit 1 #1 | 11,900 | 42331571 |
| 517638 | Feb 15, 2002 | Feb 15, 2002 | Will-Drill Production Co., Inc. | Echard Heirs #1 | 12,000 | 42331570 |
| 516050 | Feb 4, 2002 | Feb 4, 2002 | Valence Operating Company | Loggins "B" #1 | 10,665 | 42331248 |
| 517111 | Jan 25, 2002 | Jan 25, 2002 | Southwestern Energy Prod. Co. | Frank Burke Gas Unit 1 #3 | 12,200 | 42331569 |
| 517111Amendment | Jan 25, 2002 | Jan 25, 2002 | Southwestern Energy Prod. Co. | Frank Burke Gas Unit 1 #3 | 12,055 | 42331569 |
| 516362 | Dec 21, 2001 | Dec 21, 2001 | SDG Operating Company, Inc | Genecov, A.S. #3 | 7,850 | 42331568 |
| 515917 | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Vernon B. Wilson Gas Unit 1 #3 | 12,100 | 42331567 |
| 515916 | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Grady Wilson Gas Unit No. 1 #2 | 12,600 | 42331565 |
| 515915 | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Allred Gas Unit 1 #3 | 12,300 | 42331564 |
| 515914 | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Jasper Wilson Gas Unit 1 #1 | 12,400 | 42331566 |
| 515914Amendment | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Wilson, Jasper #1 | 12,400 | 42331566 |
| 515914Amendment | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Jasper Wilson Gas Unit 1 #1 | 12,400 | 42331566 |
| 514862 | Oct 30, 2001 | Oct 30, 2001 | Lynx Energy Company, Inc. | Shofner, D. D. #1 | 8,600 | 42330558 |
| 510922 | Oct 8, 2001 | Oct 8, 2001 | Greyfox Energy Partners, L.P. | Rogers, Vera #1 | 7,300 | 42331554 |
| 510922Amendment | Oct 8, 2001 | Oct 8, 2001 | Lynx Operating Co., Inc. | Rogers, Vera #1 | 7,300 | 42331554 |
| 514213 | Oct 5, 2001 | Oct 5, 2001 | Lynx Energy Company, Inc. | Green Oil Unit #1 | 8,550 | 42330795 |
| 514125 | Oct 3, 2001 | Oct 3, 2001 | Harman Operating Company, Inc. | Vickers #1 | 7,500 | 42331563 |
| 514125Amendment | Oct 3, 2001 | Oct 3, 2001 | Harman Operating Company, Inc. | Vickers #1 | 7,800 | 42331563 |
| 512465 | Sep 27, 2001 | Sep 27, 2001 | Southwestern Energy Prod. Co. | P. M. Wilson Heirs Unit 1 #2 | 11,800 | 42331561 |
| 511486 | Sep 25, 2001 | Sep 25, 2001 | Greyfox Energy Partners, L.P. | Gwin, Naomi #1 | 6,900 | 42331558 |
| 513426 | Sep 7, 2001 | Sep 7, 2001 | Southwestern Energy Prod. Co. | Carrie Matlock Gas Unit #1 #3 | 12,050 | 42331562 |
| 513368 | Sep 5, 2001 | Sep 5, 2001 | Fender Expl & Prod Co., L.L.C. | Breedlove-Rogers Gas Unit #2 | 12,000 | 42331397 |
| 511695 | Sep 5, 2001 | Sep 5, 2001 | Southwestern Energy Prod. Co. | Bright Gas Unit 1 #2 | 12,005 | 42331559 |
| 512261 | Aug 7, 2001 | Aug 7, 2001 | Southwestern Energy Prod. Co. | J. F. Ware Gas Unit 1 #3 | 12,000 | 42331560 |
| 512018 | Jul 30, 2001 | Jul 30, 2001 | Ful-Hill Oil & Gas, Inc. | Wright "D" #1 | 9,500 | 42301036 |
| 512018Amendment | Jul 30, 2001 | Jul 30, 2001 | Ful-Hill Oil & Gas, Inc. | Wright #3 | 11,700 | 42301036 |
| 510982 | Jul 9, 2001 | Jul 9, 2001 | Southwestern Energy Prod. Co. | Kickapoo Creek Gas Unit #3 | 11,850 | 42331555 |
| 510980 | Jul 9, 2001 | Jul 9, 2001 | Southwestern Energy Prod. Co. | Arnold Gas Unit 1 #3 | 11,800 | 42331556 |
| 510952 | Jul 6, 2001 | Jul 6, 2001 | Palmer Petroleum Inc. | Miller #1 | 8,500 | 42331557 |
| 509549 | May 30, 2001 | May 30, 2001 | Southwestern Energy Prod. Co. | Sallie M.warren Heirs Gas UNIT#1 #2 | 12,135 | 42331553 |
| 508769 | May 15, 2001 | May 15, 2001 | Camterra Resources, Inc. | Russell #1 | 7,800 | 42331552 |
| 505925Amendment | May 11, 2001 | May 11, 2001 | Valence Operating Company | Katherine Luscombe Gas Unit #1 | 15,000 | 42331543 |
| 508722 | May 9, 2001 | May 9, 2001 | Valence Operating Company | Bracken Grandchildren Trust #3 | 13,000 | 42331551 |
| 508604 | May 8, 2001 | May 8, 2001 | Ocean Energy, Inc. | Cade Heirs #1 | 10,200 | 42331550 |
| 508604Amendment | May 8, 2001 | May 8, 2001 | Ocean Energy, Inc. | Cade Heirs #1 | 10,200 | 42331550 |
| 507896 | Apr 19, 2001 | Apr 19, 2001 | Southwestern Energy Prod. Co. | Vernon B. Wilson Gas Unit 1 #2 | 11,900 | 42331549 |
| 507895 | Apr 19, 2001 | Apr 19, 2001 | Southwestern Energy Prod. Co. | Frank M. Burke Jr. Gas Unit 1 #2 | 11,950 | 42331548 |
| 507894 | Apr 19, 2001 | Apr 19, 2001 | Southwestern Energy Prod. Co. | Carrie Matlock Gas Unit 1 #2 | 11,900 | 42331547 |
| 506825 | Apr 2, 2001 | Apr 2, 2001 | Griffin Operating, Inc. | Goslin #1 | 6,800 | 42331546 |
| 504764 | Mar 29, 2001 | Mar 29, 2001 | Valence Operating Company | Bracken Grandchildren Trust #1 | 13,000 | 42331180 |
| 505082 | Mar 27, 2001 | Mar 27, 2001 | Southwestern Energy Prod. Co. | Woolf Gas Unit #2 | 12,500 | 42331542 |
| 507014 | Mar 26, 2001 | Mar 26, 2001 | Dreyfus, Louis Natural Gas Corp | Square #1 | 8,870 | 42330530 |
| 506174 | Mar 15, 2001 | Mar 15, 2001 | Samson Lone Star LP | Walton, Will #3 | 7,800 | 42330657 |
| 506081 | Mar 15, 2001 | Mar 15, 2001 | Samson Lone Star LP | Gilliam #2 | 8,100 | 42330870 |
| 506416 | Mar 13, 2001 | Mar 13, 2001 | Barrow-Shaver Resources Co. | Ridley, Mary #1 | 8,300 | 42331545 |
| 506294 | Mar 12, 2001 | Mar 12, 2001 | Southwestern Energy Prod. Co. | J. F. Ware Gas Unit 1 #2 | 11,900 | 42331544 |
| 505925 | Mar 6, 2001 | Mar 6, 2001 | Valence Operating Company | Katherine Luscombe Gas Unit #1 | 13,200 | 42331543 |
| 504863 | Feb 2, 2001 | Feb 2, 2001 | Gunn Oil Company | Kissam #3 | 7,200 | 42331541 |
| 504628 | Feb 1, 2001 | Feb 1, 2001 | Samson Lone Star LP | Walton, J. #2 | 8,800 | 42330712 |
| 504320 | Jan 19, 2001 | Jan 19, 2001 | Goldston Oil Corp. | Coulter, L. #1 | 7,560 | 42331538 |
| 503422 | Dec 29, 2000 | Dec 29, 2000 | Triple J Investments Inc. | Taliaferro Upper Pettit Unit #1601 | 8,360 | 42330708 |
| 503114 | Dec 15, 2000 | Dec 15, 2000 | Zapata-Fender, L. L. C. | Verner Estate #1 | 8,800 | 42331537 |
| 503114Amendment | Dec 15, 2000 | Dec 15, 2000 | Zapata-Fender, L. L. C. | Verner Estate #1 | 8,800 | 42331537 |
| 501696 | Nov 7, 2000 | Nov 7, 2000 | Valence Operating Company | Bracken Grandchildren Trust #2 | 11,400 | 42331232 |
| 501696Amendment | Nov 7, 2000 | Nov 7, 2000 | Valence Operating Company | Bracken Grandchildren Trust #2 | 12,600 | 42331232 |
| 500098 | Sep 27, 2000 | Sep 27, 2000 | Gunn Oil Company | Lane Chapel (Paulxy a) Unit #107 | 7,000 | 42331536 |
| 499066 | Aug 30, 2000 | Aug 30, 2000 | Dreyfus, Louis Natural Gas Corp | Butler Estate "B" #1 | 8,814 | 42331146 |
| 498703 | Aug 29, 2000 | Aug 29, 2000 | Union Pacific Resources Company | Sevengill Unit #1 | 17,000 | 42331535 |
| 498071 | Aug 9, 2000 | Aug 9, 2000 | Key Production Company, Inc. | Alamo/McFarland #1 | 8,000 | 42331534 |
| 497304 | Jul 18, 2000 | Jul 18, 2000 | B J Resources, L.L.C. | Norris #1 | 8,000 | 42331533 |
| 496593 | Jun 27, 2000 | Jun 27, 2000 | Barrow-Shaver Resources Co. | Arp Oil Unit No. 2 #1 | 9,200 | 42331532 |
| 496322 | Jun 19, 2000 | Jun 19, 2000 | Griffin Operating, Inc. | Bracken #1 | 6,900 | 42331531 |
| 494498 | May 9, 2000 | May 9, 2000 | Thomas Operating Ltd. Co. | Ford #3 | 6,000 | 42331530 |
| 493221 | Mar 20, 2000 | Mar 20, 2000 | Map Production Co., Inc. | Klueppel #1H | 10,850 | 42331529 |
| 493221Amendment | Mar 20, 2000 | Mar 20, 2000 | Map Production Co., Inc. | Klueppel #1H | 10,850 | 42331529 |
| 493007 | Mar 13, 2000 | Mar 13, 2000 | Dallas Production, Inc. | Johnny #1 | 8,100 | 42331528 |
| 492762 | Mar 6, 2000 | Mar 6, 2000 | Hallwood Petroleum, Inc. | Ann McKnight (Paluxy) Unit #1601 | 8,150 | 42331527 |
| 492762Amendment | Mar 6, 2000 | Mar 6, 2000 | Hallwood Petroleum, Inc. | Ann McKnight (Paluxy) Unit #1601 | 8,150 | 42331527 |
| 492241 | Mar 1, 2000 | Mar 1, 2000 | Hansen Oil Corporation | Balwahan (Paluxy) Unit #101HH | 7,700 | 42331153 |
| 491441 | Feb 10, 2000 | Feb 10, 2000 | C. W. Resources, Inc. | Loggins, Bob "A" #1A | 11,500 | 42331526 |
| 491441Amendment | Feb 10, 2000 | Feb 10, 2000 | C. W. Resources, Inc. | Bob Loggins 'a' Gas Unit #1 | 11,000 | 42331526 |
| 491441Amendment | Feb 10, 2000 | Feb 10, 2000 | C. W. Resources, Inc. | Bob Loggins 'a' Gas Unit #1 | 11,000 | 42331526 |
| 488777 | Nov 4, 1999 | Nov 4, 1999 | Ful-Hill Oil & Gas, Inc. | Wright #1 | 11,020 | 42330057 |
| 486686 | Aug 17, 1999 | Aug 17, 1999 | Thomas Operating Ltd. Co. | Ford #1 | 8,605 | 42330407 |
| 486246 | Aug 3, 1999 | Aug 3, 1999 | Circle Ridge Production, Inc. | Smith, J. E. #2D | 5,700 | 42330182 |
| 486113 | Jul 27, 1999 | Jul 27, 1999 | Key Production Company, Inc. | Lane Chapel (Paluxy a Sand) Unit #402 | 6,500 | 42331245 |
| 486113Amendment | Jul 27, 1999 | Jul 27, 1999 | Key Production Company, Inc. | Lane Chapel (Paluxy B Sand) Unit #402 | 6,500 | 42331245 |
| 486048 | Jul 23, 1999 | Jul 23, 1999 | Pioneer Natural Res. USA, Inc. | Arp GU # 1 #1 | 13,000 | 42331525 |
| 486048Amendment | Jul 23, 1999 | Jul 23, 1999 | Pioneer Natural Res. USA, Inc. | Arp GU # 1 #1 | 13,000 | 42331525 |
| 485335 | Jun 21, 1999 | Jun 21, 1999 | Lyne Energy Corporation | Murphy #1 | 6,500 | 42331524 |
| 484384 | Jun 21, 1999 | Jun 21, 1999 | Fina Oil & Chemical Company | P. M. Wilson Heirs Gas Unit #1 | 13,000 | 42331522 |
| 484957 | Jun 3, 1999 | Jun 3, 1999 | Dreyfus, Louis Natural Gas Corp | Johnson, T. #1 | 8,700 | 42330968 |
| 484677 | Jun 1, 1999 | Jun 1, 1999 | Thomas Operating Ltd. Co. | Dickerson #1 | 8,500 | 42331523 |
| 484695 | May 25, 1999 | May 25, 1999 | Thomas Operating Ltd. Co. | Hooper #1 | 8,750 | 42331015 |
| 483623 | May 12, 1999 | May 12, 1999 | Fina Oil & Chemical Company | Allred Gas Unit #1 #2 | 13,000 | 42331519 |
| 483623Amendment | May 12, 1999 | May 12, 1999 | Southwestern Energy Prod. Co. | Allred Gas Unit #1 #2 | 13,000 | 42331519 |
| 483447 | May 3, 1999 | May 3, 1999 | Fina Oil & Chemical Company | Kickapoo Creek Gas Unit 1 #2 | 11,900 | 42331518 |
| 483646 | Apr 29, 1999 | Apr 29, 1999 | Fina Oil & Chemical Company | Frank M. Burke Jr. Gas Unit 1 #2 | 11,950 | 42331548 |
| 483996 | Apr 21, 1999 | Apr 21, 1999 | Lyne Energy Corporation | Lewis-Kidd #1 | 6,600 | 42331521 |
| 483237 | Apr 5, 1999 | Apr 5, 1999 | Fina Oil & Chemical Company | Carrie Matlock Gas Unit No. 1 #2 | 11,900 | 42331547 |
| 483235 | Apr 5, 1999 | Apr 5, 1999 | Fina Oil & Chemical Company | Arnold Gas Unit 1 #2 | 11,900 | 42331517 |
| 483213 | Apr 5, 1999 | Apr 5, 1999 | Fina Oil & Chemical Company | Vernon B. Wilson Gas Unit 1 #2 | 11,900 | 42331549 |
| 483145 | Apr 5, 1999 | Apr 5, 1999 | Fina Oil & Chemical Company | Ware Gas Unit 1 #2 | 11,900 | 42331544 |
| 482314 | Jan 28, 1999 | Jan 28, 1999 | Union Pacific Resources Company | Hammerhead Unit #1 | 13,300 | 42331513 |
| 482194 | Jan 21, 1999 | Jan 21, 1999 | J-W Operating Co. | Braly, C. L. #1 | 12,000 | 42331512 |