| 639968 | Jun 11, 2007 | Jun 11, 2007 | Pioneer Natural Res. USA, Inc. | Newman "A" #2 | 10,000 | 17333328 |
| 639968Amendment | Jun 11, 2007 | Jun 11, 2007 | Pioneer Natural Res. USA, Inc. | Newman "A" #2 | 10,300 | 17333328 |
| 636180 | May 23, 2007 | May 23, 2007 | Pioneer Natural Res. USA, Inc. | Schrock, W.M. "38" #12 | 10,000 | 17333304 |
| 639148 | May 21, 2007 | May 21, 2007 | Pioneer Natural Res. USA, Inc. | Flanagan '14' #11 | 10,200 | 17333326 |
| 639148Amendment | May 21, 2007 | May 21, 2007 | Pioneer Natural Res. USA, Inc. | Flanagan '14' #11 | 10,200 | 17333326 |
| 639145 | May 21, 2007 | May 21, 2007 | Pioneer Natural Res. USA, Inc. | Cheatham "31" #2 | 10,500 | 17333324 |
| 639144 | May 21, 2007 | May 21, 2007 | Pioneer Natural Res. USA, Inc. | Cheatham #7 | 10,500 | 17333325 |
| 639142 | May 21, 2007 | May 21, 2007 | Pioneer Natural Res. USA, Inc. | Hancock "A" #1 | 10,500 | 17333323 |
| 638840 | May 18, 2007 | May 18, 2007 | Manhattan Petroleum, Inc. | Dyad-Romine "1" #1 | 11,000 | 17332070 |
| 638636 | May 16, 2007 | May 16, 2007 | Pioneer Natural Res. USA, Inc. | Cheatham "19" #2 | 10,500 | 17333322 |
| 638631 | May 16, 2007 | May 16, 2007 | Pioneer Natural Res. USA, Inc. | Cheatham "13" #2 | 10,500 | 17333321 |
| 638631Amendment | May 16, 2007 | May 16, 2007 | Pioneer Natural Res. USA, Inc. | Cheatham "13" #2 | 10,500 | 17333321 |
| 637001 | May 14, 2007 | May 14, 2007 | Endeavor Energy Resources L.P. | Patterson "44" #2 | 12,000 | 17333315 |
| 638272 | May 11, 2007 | May 11, 2007 | McClure Oil Company, Inc. | Glass "46" #1 | 7,250 | 17333314 |
| 638249 | May 11, 2007 | May 11, 2007 | Manhattan Petroleum, Inc. | Edwards 12 #1 | 11,000 | 17333313 |
| 638248 | May 11, 2007 | May 11, 2007 | Manhattan Petroleum, Inc. | Edwards 13 #1 | 11,000 | 17333312 |
| 638168 | May 9, 2007 | May 9, 2007 | Range Production Company | Edmondson A #2732 | 8,800 | 17333310 |
| 637986 | May 1, 2007 | May 1, 2007 | McClure Oil Company, Inc. | Archer #1 | 7,300 | 17333309 |
| 637682 | May 1, 2007 | May 1, 2007 | WTG Exploration | Adcock, Helen Zant #1 | 10,680 | 17331846 |
| 637563 | Apr 30, 2007 | Apr 30, 2007 | Manhattan Petroleum, Inc. | Cookbooks #2402 | 11,000 | 17331995 |
| 636176 | Apr 27, 2007 | Apr 27, 2007 | Pioneer Natural Res. USA, Inc. | Calverley, JB #17 | 10,000 | 17333305 |
| 637254 | Apr 25, 2007 | Apr 25, 2007 | Range Production Company | Glass 16 #7 | 9,250 | 17333308 |
| 637252 | Apr 24, 2007 | Apr 24, 2007 | Range Production Company | Edmondson A #2629 | 9,300 | 17333307 |
| 636369 | Apr 19, 2007 | Apr 19, 2007 | Mariner Energy, Inc. | Niehues "A" #4TM | 8,350 | 17333306 |
| 636329 | Apr 9, 2007 | Apr 9, 2007 | Manhattan Petroleum, Inc. | Cookbooks #2401 | 11,000 | 17332648 |
| 636055 | Apr 3, 2007 | Apr 3, 2007 | Henry Petroleum LP | Currie #605 | 9,473 | 17333256 |
| 636013 | Apr 2, 2007 | Apr 2, 2007 | Manhattan Petroleum, Inc. | Edwards 9A #2 | 11,000 | 17331218 |
| 636013Amendment | Apr 2, 2007 | Apr 2, 2007 | Manhattan Petroleum, Inc. | Edwards 9A #2H | 11,000 | 17331218 |
| 633320 | Mar 29, 2007 | Mar 29, 2007 | Pioneer Natural Res. USA, Inc. | Schrock, W. M. "24" #15 | 10,500 | 17333296 |
| 633320Amendment | Mar 29, 2007 | Mar 29, 2007 | Pioneer Natural Res. USA, Inc. | Schrock, W. M. "24" #15 | 10,500 | 17333296 |
| 633312 | Mar 29, 2007 | Mar 29, 2007 | Pioneer Natural Res. USA, Inc. | Schrock, W. M. "24" #13 | 10,500 | 17333295 |
| 635476 | Mar 26, 2007 | Mar 26, 2007 | Reef Exploration, L.P. | Cole Ranch "45" #3 | 8,800 | 17333298 |
| 635475 | Mar 26, 2007 | Mar 26, 2007 | Reef Exploration, L.P. | Cole Ranch 45 #2 | 8,900 | 17333302 |
| 635472 | Mar 26, 2007 | Mar 26, 2007 | Reef Exploration, L.P. | Cole Ranch "44 #4 | 9,000 | 17333303 |
| 635470 | Mar 26, 2007 | Mar 26, 2007 | Reef Exploration, L.P. | Cole Ranch "44" #3 | 8,900 | 17333301 |
| 635469 | Mar 26, 2007 | Mar 26, 2007 | Reef Exploration, L.P. | Cole Ranch "41" #4 | 8,900 | 17333299 |
| 635467 | Mar 26, 2007 | Mar 26, 2007 | Reef Exploration, L.P. | Cole Ranch "40" #3 | 8,800 | 17333300 |
| 634012 | Feb 27, 2007 | Feb 27, 2007 | Samson Lone Star LP | Grail #1 | 9,000 | 17333297 |
| 634012Amendment | Feb 27, 2007 | Feb 27, 2007 | Samson Lone Star, LLC | Grail #1 | 9,000 | 17333297 |
| 632170 | Jan 23, 2007 | Jan 23, 2007 | MDC Operating, Inc. | Cooper "301" Lease #2 | 8,300 | 17333294 |
| 630991 | Jan 19, 2007 | Jan 19, 2007 | McClure Oil Company, Inc. | Glass "45-A" #2 | 7,500 | 17333293 |
| 630991Amendment | Jan 19, 2007 | Jan 19, 2007 | McClure Oil Company, Inc. | Glass "45-A" #2 | 7,500 | 17333293 |
| 631330 | Jan 5, 2007 | Jan 5, 2007 | Reef Exploration, L.P. | Cole Ranch "44" #2 | 8,750 | 17333292 |
| 631328 | Jan 4, 2007 | Jan 4, 2007 | Reef Exploration, L.P. | Cole Ranch "41" #3 | 8,750 | 17333290 |
| 631327 | Jan 4, 2007 | Jan 4, 2007 | Reef Exploration, L.P. | Cole Ranch "41" #2 | 8,750 | 17333291 |
| 631326 | Jan 4, 2007 | Jan 4, 2007 | Reef Exploration, L.P. | Cole Ranch "41" #1 | 8,750 | 17333289 |
| 631324 | Jan 4, 2007 | Jan 4, 2007 | Reef Exploration, L.P. | Cole Ranch '40' #2 | 8,750 | 17333288 |
| 630973 | Dec 22, 2006 | Dec 22, 2006 | Endeavor Energy Resources L.P. | Patterson "44" #1 | 12,000 | 17333287 |
| 630954 | Dec 22, 2006 | Dec 22, 2006 | Pioneer Natural Res. USA, Inc. | Flanagan 14 #16 | 10,200 | 17333286 |
| 630954Amendment | Dec 22, 2006 | Dec 22, 2006 | Pioneer Natural Res. USA, Inc. | Flanagan 14 #16 | 10,200 | 17333286 |
| 630334 | Dec 22, 2006 | Dec 22, 2006 | Ruwco Oil and Gas Corp. | McDonald #1 | 7,000 | 17333275 |
| 630956 | Dec 21, 2006 | Dec 21, 2006 | Pioneer Natural Res. USA, Inc. | Cheatham #4 | 10,200 | 17333285 |
| 630951 | Dec 21, 2006 | Dec 21, 2006 | Pioneer Natural Res. USA, Inc. | Houston, H. A. "A" #16 | 10,000 | 17333284 |
| 630935 | Dec 21, 2006 | Dec 21, 2006 | Pioneer Natural Res. USA, Inc. | Houston, H. A. "A" #8 | 10,000 | 17333283 |
| 630931 | Dec 21, 2006 | Dec 21, 2006 | Pioneer Natural Res. USA, Inc. | Houston, H. A. "A" #14 | 10,000 | 17333282 |
| 630929 | Dec 21, 2006 | Dec 21, 2006 | Pioneer Natural Res. USA, Inc. | Cheatham #6 | 10,200 | 17333281 |
| 630786 | Dec 20, 2006 | Dec 20, 2006 | Pioneer Natural Res. USA, Inc. | Hoelscher "16" #3 | 10,500 | 17333278 |
| 630786Amendment | Dec 20, 2006 | Dec 20, 2006 | Pioneer Natural Res. USA, Inc. | Hoelscher "16" #3 | 10,500 | 17333278 |
| 630785 | Dec 20, 2006 | Dec 20, 2006 | Pioneer Natural Res. USA, Inc. | Hoelscher "16" #2 | 10,500 | 17333277 |
| 630782 | Dec 20, 2006 | Dec 20, 2006 | Pioneer Natural Res. USA, Inc. | Jost #8 | 10,000 | 17333280 |
| 630781 | Dec 20, 2006 | Dec 20, 2006 | Pioneer Natural Res. USA, Inc. | Jost #7 | 10,000 | 17333279 |
| 630754 | Dec 20, 2006 | Dec 20, 2006 | Boyd & McWilliams Energy Group | Ballenger #1 | 8,900 | 17333276 |
| 630553 | Dec 15, 2006 | Dec 15, 2006 | McClure Oil Company, Inc. | Glass "40" #1 | 7,500 | 17333274 |
| 630553Amendment | Dec 15, 2006 | Dec 15, 2006 | McClure Oil Company, Inc. | Glass "40" #1 | 7,500 | 17333274 |
| 630556 | Dec 14, 2006 | Dec 14, 2006 | Reef Exploration, L.P. | Ranches "45" #1 | 8,750 | 17333273 |
| 630556Amendment | Dec 14, 2006 | Dec 14, 2006 | Reef Exploration, L.P. | Cole Ranch "45" #1 | 8,750 | 17333273 |
| 630525 | Dec 14, 2006 | Dec 14, 2006 | Reef Exploration, L.P. | Ranches "44" #1 | 8,750 | 17333272 |
| 630525Amendment | Dec 14, 2006 | Dec 14, 2006 | Reef Exploration, L.P. | Cole Ranch "44" #1 | 8,750 | 17333272 |
| 629667 | Dec 14, 2006 | Dec 14, 2006 | Range Production Company | Edmondson A #2530 | 9,000 | 17333271 |
| 629665 | Dec 14, 2006 | Dec 14, 2006 | Range Production Company | Curry 17 #3 | 9,000 | 17333270 |
| 629665Amendment | Dec 14, 2006 | Dec 14, 2006 | Range Production Company | Curry 17 #3 | 9,500 | 17333270 |
| 630248 | Dec 11, 2006 | Dec 11, 2006 | Reef Exploration, L.P. | Ranches "40" #1 | 8,750 | 17333269 |
| 630248Amendment | Dec 11, 2006 | Dec 11, 2006 | Reef Exploration, L.P. | Cole Ranch "40" #1 | 8,750 | 17333269 |
| 630193 | Dec 8, 2006 | Dec 8, 2006 | Mariner Energy, Inc. | Reed -21- #3TM | 9,000 | 17333268 |
| 630193Amendment | Dec 8, 2006 | Dec 8, 2006 | Mariner Energy, Inc. | Reed -21- #3TM | 9,000 | 17333268 |
| 629398 | Nov 22, 2006 | Nov 22, 2006 | Cimarex Energy Co. of Colorado | Chriesman -B- #3 | 8,950 | 17333266 |
| 629392 | Nov 22, 2006 | Nov 22, 2006 | Cimarex Energy Co. of Colorado | Chriesman, E. -B- #5 | 8,950 | 17333267 |
| 629390 | Nov 22, 2006 | Nov 22, 2006 | Cimarex Energy Co. of Colorado | Chriesman B #4 | 8,950 | 17333265 |
| 628995 | Nov 14, 2006 | Nov 14, 2006 | Pioneer Natural Res. USA, Inc. | Poe #1 | 9,875 | 17333264 |
| 628948 | Nov 14, 2006 | Nov 14, 2006 | Pioneer Natural Res. USA, Inc. | Fowler "B" #1 | 9,975 | 17333263 |
| 628495 | Nov 7, 2006 | Nov 7, 2006 | Mariner Energy, Inc. | Hoelscher, H. W. -B- #3TM | 9,000 | 17333262 |
| 628481 | Nov 3, 2006 | Nov 3, 2006 | Henry Petroleum LP | Neste CURRIE44 #2 | 10,179 | 17332090 |
| 628481Amendment | Nov 3, 2006 | Nov 3, 2006 | Henry Petroleum LP | Neste CURRIE44 #2 | 10,179 | 17332090 |
| 628045 | Oct 25, 2006 | Oct 25, 2006 | Pioneer Natural Res. USA, Inc. | Houston Ranch "36" #1 | 10,000 | 17333261 |
| 628043 | Oct 25, 2006 | Oct 25, 2006 | Pioneer Natural Res. USA, Inc. | Cheatham "31" #1 | 10,000 | 17333260 |
| 628043Amendment | Oct 25, 2006 | Oct 25, 2006 | Pioneer Natural Res. USA, Inc. | Cheatham "31" #1 | 10,000 | 17333260 |
| 628041 | Oct 25, 2006 | Oct 25, 2006 | Pioneer Natural Res. USA, Inc. | Cheatham "19" #1 | 10,000 | 17333259 |
| 628039 | Oct 25, 2006 | Oct 25, 2006 | Pioneer Natural Res. USA, Inc. | Houston Ranch "47" #1 | 9,900 | 17333258 |
| 627779 | Oct 25, 2006 | Oct 25, 2006 | Kaiser-Francis Oil Company | Glasscock Unit #2 | 8,030 | 17310340 |
| 627616 | Oct 24, 2006 | Oct 24, 2006 | Henry Petroleum LP | Currie "E" #4103 | 10,500 | 17333257 |
| 627562 | Oct 23, 2006 | Oct 23, 2006 | Henry Petroleum LP | Currie #2707 | 10,000 | 17333162 |
| 627544 | Oct 23, 2006 | Oct 23, 2006 | Henry Petroleum LP | Currie #605 | 10,000 | 17333256 |
| 627544Amendment | Oct 23, 2006 | Oct 23, 2006 | COG Operating LLC | Currie #605 | 10,000 | 17333256 |
| 627507 | Oct 13, 2006 | Oct 13, 2006 | Henry Petroleum LP | Currie "E" #3107 | 10,500 | 17333255 |
| 626859 | Oct 2, 2006 | Oct 2, 2006 | Pioneer Natural Res. USA, Inc. | Jost #4 | 9,400 | 17333254 |
| 626859Amendment | Oct 2, 2006 | Oct 2, 2006 | Pioneer Natural Res. USA, Inc. | Jost #4 | 9,500 | 17333254 |
| 626572 | Sep 27, 2006 | Sep 27, 2006 | Boyd & McWilliams Energy Group | Ballenger 45 #2 | 8,500 | 17330886 |
| 626328 | Sep 21, 2006 | Sep 21, 2006 | Endeavor Energy Resources L.P. | Koonce "46" #2 | 12,000 | 17333253 |
| 624607 | Sep 5, 2006 | Sep 5, 2006 | Endeavor Energy Resources L.P. | Koonce '39' #2 | 12,000 | 17333252 |
| 625219 | Aug 30, 2006 | Aug 30, 2006 | Mariner Energy, Inc. | Jimerson "A" #3TM | 9,000 | 17333251 |