| 505660 | Feb 28, 2001 | Feb 28, 2001 | Key Production Company, Inc. | Alexander, John D. #1 | 9,838 | 28930872 |
| 505660Amendment | Feb 28, 2001 | Feb 28, 2001 | Key Production Company, Inc. | Alexander, John D. #1 | 9,900 | 28930872 |
| 505573 | Feb 20, 2001 | Feb 20, 2001 | EOG Resources, Inc. | Johnson "AB" Gas Unit #4 | 10,200 | 28931343 |
| 504145 | Jan 26, 2001 | Jan 26, 2001 | Calto Operating Company, Inc. | Helmcamp #1 | 10,300 | 28930075 |
| 502544 | Dec 28, 2000 | Dec 28, 2000 | Valence Operating Company | Campbell Gas Unit #1 | 8,400 | 28931265 |
| 502544Amendment | Dec 28, 2000 | Dec 28, 2000 | Valence Operating Company | Campbell Gas Unit #1 | 10,260 | 28931265 |
| 503482 | Dec 27, 2000 | Dec 27, 2000 | EOG Resources, Inc. | "Corby" No. 1 Gas Unit #2 | 15,500 | 28931342 |
| 503482Amendment | Dec 27, 2000 | Dec 27, 2000 | EOG Resources, Inc. | "Corby" No. 1 Gas Unit #2 | 15,500 | 28931342 |
| 503294 | Dec 20, 2000 | Dec 20, 2000 | Samedan Oil Corporation | Beddingfield #1 | 14,600 | 28931341 |
| 502979 | Dec 18, 2000 | Dec 18, 2000 | Tidy Energy Resources Inc. | Vanderbeek, J. W. #1 | 17,500 | 28931276 |
| 502973 | Dec 12, 2000 | Dec 12, 2000 | T-Bar-X Limited Company | Phelps No. 1 #1 | 9,500 | 28931340 |
| 502543 | Dec 4, 2000 | Dec 4, 2000 | Valence Operating Company | Russell "A" #3 | 9,300 | 28931263 |
| 502407 | Nov 28, 2000 | Nov 28, 2000 | EOG Resources, Inc. | Jensen "a" Gas Unit #3 | 15,500 | 28931339 |
| 502407Amendment | Nov 28, 2000 | Nov 28, 2000 | EOG Resources, Inc. | Jensen "a" Gas Unit #3 | 15,500 | 28931339 |
| 501547 | Nov 7, 2000 | Nov 7, 2000 | Valence Operating Company | Campbell Gas Unit #3 | 8,400 | 28931293 |
| 501475 | Nov 1, 2000 | Nov 1, 2000 | Valence Operating Company | Campbell Gas Unit #2 | 8,250 | 28931288 |
| 501475Amendment | Nov 1, 2000 | Nov 1, 2000 | Valence Operating Company | Campbell Gas Unit #2 | 10,287 | 28931288 |
| 501379 | Nov 1, 2000 | Nov 1, 2000 | Calto Operating Company, Inc. | Montgomery, J. R. #2 | 10,650 | 28931338 |
| 501310 | Oct 27, 2000 | Oct 27, 2000 | EOG Resources, Inc. | Johnson "AB" Gas Unit #3 | 15,500 | 28931337 |
| 501310Amendment | Oct 27, 2000 | Oct 27, 2000 | EOG Resources, Inc. | Johnson "AB" Gas Unit #3 | 15,500 | 28931337 |
| 501294 | Oct 26, 2000 | Oct 26, 2000 | Pioneer Natural Res. USA, Inc. | Watson #2 | 13,900 | 28931239 |
| 500857 | Oct 18, 2000 | Oct 18, 2000 | Machin & Associates, Inc. | Wilson #1 | 8,500 | 28931336 |
| 500754 | Oct 13, 2000 | Oct 13, 2000 | Anadarko Petroleum Corp. | Hodges "A" #1 | 14,700 | 28931335 |
| 500754Amendment | Oct 13, 2000 | Oct 13, 2000 | Anadarko Petroleum Corp. | Hodges "A" #1 | 14,700 | 28931335 |
| 500590 | Oct 13, 2000 | Oct 13, 2000 | Aber Oil & Gas Co. | SW Oakwood GU #4 #1 | 5,800 | 28900162 |
| 500590Amendment | Oct 13, 2000 | Oct 13, 2000 | Aber Oil & Gas Co. | SW Oakwood GU #4 #1 | 5,800 | 28900162 |
| 499606 | Sep 22, 2000 | Sep 22, 2000 | Palmer Petroleum Inc. | Haley Estate #1 | 6,500 | 28931334 |
| 499606Amendment | Sep 22, 2000 | Sep 22, 2000 | Palmer Petroleum Inc. | Haley Estate #1 | 6,300 | 28931334 |
| 499491 | Sep 11, 2000 | Sep 11, 2000 | Carr Resources, Inc. | T-Bar-X Corby #4 | 9,000 | 28931333 |
| 498634 | Aug 18, 2000 | Aug 18, 2000 | Mitchell Energy Corporation | Napoleon Gould et Al #1 | 8,700 | 28931332 |
| 497257 | Jul 17, 2000 | Jul 17, 2000 | Odegard Energy, Inc. | Fortson #1 | 6,400 | 28931331 |
| 496812 | Jul 17, 2000 | Jul 17, 2000 | Valence Operating Company | Ellis "B" #3 | 9,800 | 28931328 |
| 497185 | Jul 13, 2000 | Jul 13, 2000 | Mitchell Energy Corporation | Afwdu #203 | 8,800 | 28931330 |
| 497184 | Jul 13, 2000 | Jul 13, 2000 | Mitchell Energy Corporation | Afwdu #302 | 8,800 | 28931329 |
| 496782 | Jun 30, 2000 | Jun 30, 2000 | El Paso Production Company | Cox, Weldon GU #1 | 9,085 | 28930354 |
| 496444 | Jun 26, 2000 | Jun 26, 2000 | Pioneer Natural Res. USA, Inc. | Harrington #1 | 17,650 | 28931286 |
| 496022 | Jun 9, 2000 | Jun 9, 2000 | EOG Resources, Inc. | Johnson "AB" Gas Unit #2 | 10,500 | 28931327 |
| 495387 | May 30, 2000 | May 30, 2000 | Valence Operating Company | Lewis "B" #2 | 10,000 | 28931326 |
| 495137 | May 17, 2000 | May 17, 2000 | Commonwealth Energy (USA) Inc. | T-Bar-X Bedsole #1RX | 17,000 | 28931283 |
| 495137Amendment | May 17, 2000 | May 17, 2000 | Carr Resources, Inc. | T-Bar-X Bedsole #1 | 16,270 | 28931283 |
| 493442 | May 4, 2000 | May 4, 2000 | Valence Operating Company | Campbell Gas Unit #4 | 9,800 | 28931320 |
| 494548 | May 3, 2000 | May 3, 2000 | SDG Operating Company, Inc | Dorr, Ivy Rogers #1 | 10,500 | 28930727 |
| 494495 | Apr 27, 2000 | Apr 27, 2000 | Marathon Oil Company | Newell "A" #5 | 10,500 | 28931325 |
| 494188 | Apr 17, 2000 | Apr 17, 2000 | Mitchell Energy Corporation | Lackey, Mark W. #1 | 8,800 | 28931324 |
| 493976 | Apr 11, 2000 | Apr 11, 2000 | Anadarko Petroleum Corp. | Carter "A" #1 | 16,500 | 28931323 |
| 493976Amendment | Apr 11, 2000 | Apr 11, 2000 | Anadarko Petroleum Corp. | Carter "A" #1 | 18,000 | 28931323 |
| 493976Amendment | Apr 11, 2000 | Apr 11, 2000 | Anadarko Petroleum Corp. | Carter "A" #1 | 18,000 | 28931323 |
| 492586 | Apr 4, 2000 | Apr 4, 2000 | Valence Operating Company | Gillen, Ira #2 | 9,800 | 28931318 |
| 493603 | Mar 29, 2000 | Mar 29, 2000 | Mitchell Energy Corporation | Afwdu #202 | 8,800 | 28931322 |
| 493552 | Mar 28, 2000 | Mar 28, 2000 | Marathon Oil Company | Newell "A" #4 | 10,500 | 28931321 |
| 493552Amendment | Mar 28, 2000 | Mar 28, 2000 | Marathon Oil Company | Newell "A" #4 | 9,709 | 28931321 |
| 493076 | Mar 23, 2000 | Mar 23, 2000 | Valence Operating Company | Ellis "8" #2 | 9,800 | 28931319 |
| 493075 | Mar 17, 2000 | Mar 17, 2000 | Barrow-Shaver Resources Co. | Carbalan #2 | 17,500 | 28931255 |
| 492657 | Mar 2, 2000 | Mar 2, 2000 | Smith Petroleum Company | Floyd, E. G. #1 | 6,418 | 28930474 |
| 492477 | Mar 1, 2000 | Mar 1, 2000 | Stallion Oil Company | Barron-Hartman #2 | 11,500 | 28931317 |
| 491932Amendment | Feb 11, 2000 | Feb 11, 2000 | Buffco Production Inc. | Anne #1 | 6,450 | 28931315 |
| 491905 | Feb 9, 2000 | Feb 9, 2000 | Marathon Oil Company | Pinnacle #4 | 9,900 | 28931314 |
| 490599 | Feb 8, 2000 | Feb 8, 2000 | Marathon Oil Company | Newell "A" #3 | 10,500 | 28931310 |
| 490936 | Jan 10, 2000 | Jan 10, 2000 | Marathon Oil Company | Bogs "A" #2 | 10,300 | 28931313 |
| 490830 | Jan 5, 2000 | Jan 5, 2000 | Carr Resources, Inc. | Grayson, Ann #1 | 9,800 | 28931312 |
| 490784 | Jan 4, 2000 | Jan 4, 2000 | Bledsoe Petro Corporation | Tandy, W. L. #5 | 6,000 | 28931311 |
| 490676 | Dec 27, 1999 | Dec 27, 1999 | Spicer Oil Company, Inc. | Champion Ranch #1 | 7,000 | 28931280 |
| 490191 | Dec 14, 1999 | Dec 14, 1999 | Calto Operating Company, Inc. | Hill, A. G. #3 | 10,600 | 28931309 |
| 487705 | Dec 13, 1999 | Dec 13, 1999 | Mitchell Energy Corporation | Afwdu #402 | 8,800 | 28931305 |
| 489887 | Dec 3, 1999 | Dec 3, 1999 | SDG Operating Company, Inc | Dorr #2 | 8,100 | 28931308 |
| 489419 | Nov 12, 1999 | Nov 12, 1999 | Blue Star Operating Company | T-Bar-X Winstead #1 | 18,000 | 28931307 |
| 489419Amendment | Nov 12, 1999 | Nov 12, 1999 | Blue Star Operating Company | T-Bar-X Winstead #1 | 20,000 | 28931307 |
| 487882 | Sep 23, 1999 | Sep 23, 1999 | Marathon Oil Company | Newell "A" #2 | 10,200 | 28931306 |
| 487155 | Sep 1, 1999 | Sep 1, 1999 | Marathon Oil Company | Holmes "S" #3 | 10,200 | 28931304 |
| 487025 | Aug 26, 1999 | Aug 26, 1999 | Williams Prod. Gulf Coast, L.P. | Allison #1 | 16,000 | 28931303 |
| 486284 | Aug 24, 1999 | Aug 24, 1999 | Sonat Exploration Company -Tyler | Blazek #4 | 17,000 | 28931230 |
| 486137 | Jul 30, 1999 | Jul 30, 1999 | Valence Operating Company | Gillen, Ira #1 | 9,700 | 28931301 |
| 486186 | Jul 27, 1999 | Jul 27, 1999 | Marathon Oil Company | Pinnacle #3 | 9,800 | 28931302 |
| 485128 | Jul 20, 1999 | Jul 20, 1999 | Mitchell Energy Corporation | Afwdu #403 | 8,800 | 28931299 |
| 485893 | Jul 16, 1999 | Jul 16, 1999 | Carr Resources, Inc. | T-Bar-X Carrington #1 | 12,600 | 28931234 |
| 485893Amendment | Jul 16, 1999 | Jul 16, 1999 | Carr Resources, Inc. | T-Bar-X Carrington #1 | 12,800 | 28931234 |
| 485304 | Jun 24, 1999 | Jun 24, 1999 | Palmer Petroleum Inc. | Simpson Estate #2 | 6,500 | 28931300 |
| 483662 | Apr 28, 1999 | Apr 28, 1999 | Fortson Oil Company | Carter #2 | 10,000 | 28930869 |
| 483044 | Mar 3, 1999 | Mar 3, 1999 | Carr Resources, Inc. | T-Bar-X Corby "A" #3 | 9,800 | 28931298 |
| 482371 | Feb 4, 1999 | Feb 4, 1999 | Calto Operating Company, Inc. | A. G. Hill Gas Unit #1 | 10,020 | 28930061 |
| 481912 | Jan 12, 1999 | Jan 12, 1999 | Sonat Exploration Company -Tyler | Hunter Gas Unit #5 | 15,000 | 28931203 |
| 481797 | Dec 28, 1998 | Dec 28, 1998 | Ricks Expl Acquisition Corp | Pettey-Kahla #1 | 17,500 | 28931297 |
| 481444 | Dec 11, 1998 | Dec 11, 1998 | Marathon Oil Company | Holmes "S" #2 | 10,100 | 28931296 |
| 479832 | Nov 4, 1998 | Nov 4, 1998 | Valence Operating Company | Campbell Gas Unit #3 | 10,400 | 28931293 |
| 480516 | Oct 30, 1998 | Oct 30, 1998 | Calto Operating Company, Inc. | Guinn Gas Unit #2 | 10,600 | 28931295 |
| 480199 | Oct 15, 1998 | Oct 15, 1998 | Apache Corporation | Alexander, J. D. Unit 2 #1 | 9,263 | 28930914 |
| 479955 | Oct 7, 1998 | Oct 7, 1998 | Carr Resources, Inc. | T Bar X Corby #2 | 9,001 | 28931294 |
| 478268 | Jul 27, 1998 | Jul 27, 1998 | Rippy Oil Company | Harcrow #1 | 10,000 | 28931246 |
| 478268Amendment | Jul 27, 1998 | Jul 27, 1998 | Rippy Oil Company | Harcrow #1 | 10,000 | 28931246 |
| 478053 | Jul 24, 1998 | Jul 24, 1998 | Italian-American Oil Co., Inc. | Harrington, N. G. #1 | 6,000 | 28931292 |
| 477402 | Jun 30, 1998 | Jun 30, 1998 | Helmerich & Payne, Inc. | Willingham #1 | 17,000 | 28931291 |
| 477402Amendment | Jun 30, 1998 | Jun 30, 1998 | Helmerich & Payne, Inc. | Willingham #1 | 16,110 | 28931291 |
| 476303 | May 15, 1998 | May 15, 1998 | Amoco Production Company | Martin Gas Unit #1 | 19,000 | 28931290 |
| 475169 | Apr 24, 1998 | Apr 24, 1998 | Calto Operating Company, Inc. | Helmcamp #1 | 10,300 | 28930075 |
| 475087 | Apr 13, 1998 | Apr 13, 1998 | Calto Operating Company, Inc. | Sharp, A. L. et Al #2 | 10,400 | 28931289 |
| 473971 | Mar 10, 1998 | Mar 10, 1998 | Valence Operating Company | Campbell Gas Unit #2 | 10,400 | 28931288 |
| 473063 | Feb 9, 1998 | Feb 9, 1998 | Amoco Production Company | Dinkins, O. Theodore Jr #1 | 18,500 | 28931287 |
| 472804 | Feb 2, 1998 | Feb 2, 1998 | Pioneer Natural Res. USA, Inc. | Harrington #1 | 18,000 | 28931286 |
| 472251 | Jan 22, 1998 | Jan 22, 1998 | Valence Operating Company | Russell "A" #2 | 9,800 | 28931022 |
| 472181 | Jan 14, 1998 | Jan 14, 1998 | Marathon Oil Company | Marshall "A" #7 | 10,900 | 28931285 |