| 658992 | Apr 22, 2008 | Apr 22, 2008 | Pioneer Natural Res. USA, Inc. | Houston "30" #1 | 9,000 | 17333390 |
| 658992Amendment | Apr 22, 2008 | Apr 22, 2008 | Pioneer Natural Res. USA, Inc. | Houston "30" #1 | 10,200 | 17333390 |
| 658988 | Apr 22, 2008 | Apr 22, 2008 | Pioneer Natural Res. USA, Inc. | Witt "24" #1 | 9,000 | 17333389 |
| 658505 | Apr 14, 2008 | Apr 14, 2008 | Range Production Company | Edmondson A #3030 | 9,330 | 17333387 |
| 658114 | Apr 8, 2008 | Apr 8, 2008 | Merit Energy Company | Hutchison #5 | 10,500 | 17333386 |
| 658108 | Apr 8, 2008 | Apr 8, 2008 | Merit Energy Company | Meadors #9 | 10,500 | 17333385 |
| 654813 | Mar 28, 2008 | Mar 28, 2008 | Endeavor Energy Resources L.P. | Earhart "34A" #2 | 12,000 | 17333374 |
| 653116 | Mar 26, 2008 | Mar 26, 2008 | Pioneer Natural Res. USA, Inc. | Schrock, Wm "38" #15 | 11,000 | 17333368 |
| 657053 | Mar 21, 2008 | Mar 21, 2008 | Pioneer Natural Res. USA, Inc. | Herzog "9" #2 | 10,400 | 17333384 |
| 657047 | Mar 21, 2008 | Mar 21, 2008 | Pioneer Natural Res. USA, Inc. | Houston "5" #1 | 10,500 | 17333382 |
| 657047Amendment | Mar 21, 2008 | Mar 21, 2008 | Pioneer Natural Res. USA, Inc. | Houston "5" #1 | 10,500 | 17333382 |
| 657047Amendment | Mar 21, 2008 | Mar 21, 2008 | Pioneer Natural Res. USA, Inc. | Houston "5" #1 | 11,000 | 17333382 |
| 657042 | Mar 21, 2008 | Mar 21, 2008 | Pioneer Natural Res. USA, Inc. | Houston Ranch "25" #2 | 10,500 | 17333381 |
| 657038 | Mar 21, 2008 | Mar 21, 2008 | Pioneer Natural Res. USA, Inc. | Houston Ranch "36" #4 | 10,000 | 17333380 |
| 657038Amendment | Mar 21, 2008 | Mar 21, 2008 | Pioneer Natural Res. USA, Inc. | Houston Ranch "36" #4 | 10,000 | 17333380 |
| 657035 | Mar 21, 2008 | Mar 21, 2008 | Special Energy Corporation | Neal-Edwards "48" #1 | 10,000 | 17333379 |
| 657031 | Mar 21, 2008 | Mar 21, 2008 | Pioneer Natural Res. USA, Inc. | Cheatham "13" #4 | 10,300 | 17333378 |
| 657040 | Mar 18, 2008 | Mar 18, 2008 | McClure Oil Company, Inc. | Archer #2 | 7,250 | 17333383 |
| 653118 | Mar 11, 2008 | Mar 11, 2008 | Pioneer Natural Res. USA, Inc. | Schrock, Wm "38" #16 | 11,000 | 17333369 |
| 653115 | Mar 11, 2008 | Mar 11, 2008 | Pioneer Natural Res. USA, Inc. | Schrock, Wm "38" #14 | 11,000 | 17333367 |
| 653105 | Mar 11, 2008 | Mar 11, 2008 | Pioneer Natural Res. USA, Inc. | Schrock, Wm "38" #13 | 11,000 | 17333366 |
| 653105Amendment | Mar 11, 2008 | Mar 11, 2008 | Pioneer Natural Res. USA, Inc. | Schrock, W. M. "38" #13 | 11,000 | 17333366 |
| 655615 | Feb 26, 2008 | Feb 26, 2008 | Special Energy Corporation | Reynolds #1 | 9,500 | 17333377 |
| 654992 | Feb 20, 2008 | Feb 20, 2008 | Henry Petroleum LP | Currie #705 | 10,000 | 17333376 |
| 654990 | Feb 19, 2008 | Feb 19, 2008 | Henry Petroleum LP | Currie 'E' #505 | 10,000 | 17333375 |
| 654831 | Feb 15, 2008 | Feb 15, 2008 | Endeavor Energy Resources L.P. | Patterson "44" #4 | 12,000 | 17333372 |
| 654764 | Feb 15, 2008 | Feb 15, 2008 | Sheridan Production Company, LLC | Glasscock, Howard W. (G-S) Unit #1317 | 3,200 | 17330286 |
| 654803 | Feb 14, 2008 | Feb 14, 2008 | Endeavor Energy Resources L.P. | Patterson "44" #3 | 12,000 | 17333371 |
| 654206 | Feb 11, 2008 | Feb 11, 2008 | Atropos Exploration Company | Hirt 27 #1 | 10,300 | 17333370 |
| 654206Amendment | Feb 11, 2008 | Feb 11, 2008 | Atropos Exploration Company | Hirt 27 #1 | 10,300 | 17333370 |
| 650978 | Jan 22, 2008 | Jan 22, 2008 | Mariner Energy, Inc. | Broseh -A- #3TM | 12,000 | 17333361 |
| 650978Amendment | Jan 22, 2008 | Jan 22, 2008 | Mariner Energy, Inc. | Broseh -A- #3TM | 12,000 | 17333361 |
| 652293 | Jan 9, 2008 | Jan 9, 2008 | Pioneer Natural Res. USA, Inc. | Fowler "B" #2 | 10,500 | 17333365 |
| 652065 | Jan 4, 2008 | Jan 4, 2008 | Pioneer Natural Res. USA, Inc. | Spraberry Driver Unit #933A | 8,400 | 17333364 |
| 650470 | Jan 3, 2008 | Jan 3, 2008 | Mariner Energy, Inc. | Niehues "B" #2TM | 10,000 | 17333359 |
| 651966 | Jan 2, 2008 | Jan 2, 2008 | Pioneer Natural Res. USA, Inc. | Spraberry Driver Unit #924A | 8,400 | 17333363 |
| 651947 | Jan 2, 2008 | Jan 2, 2008 | Pioneer Natural Res. USA, Inc. | Spraberry Driver Unit #913A | 8,400 | 17333362 |
| 649992 | Dec 28, 2007 | Dec 28, 2007 | Mariner Energy, Inc. | Glass #8TM | 10,000 | 17333358 |
| 649992Amendment | Dec 28, 2007 | Dec 28, 2007 | Mariner Energy, Inc. | Glass #8TM | 10,000 | 17333358 |
| 640249Amendment | Dec 28, 2007 | Dec 28, 2007 | Pioneer Natural Res. USA, Inc. | Houston Ranch '12' #2 | 10,500 | 17333335 |
| 649597 | Dec 20, 2007 | Dec 20, 2007 | Mariner Energy, Inc. | Hoelscher #4TM | 12,000 | 17333356 |
| 650975 | Dec 14, 2007 | Dec 14, 2007 | Page Operating, LLC | Cooper #1 | 10,500 | 17333360 |
| 650975Amendment | Dec 14, 2007 | Dec 14, 2007 | Page Operating, LLC | Cooper #1 | 10,500 | 17333360 |
| 647277 | Nov 27, 2007 | Nov 27, 2007 | Pioneer Natural Res. USA, Inc. | Bailey "A" #1 | 10,000 | 17333352 |
| 647277Amendment | Nov 27, 2007 | Nov 27, 2007 | Pioneer Natural Res. USA, Inc. | Bailey "A" #1 | 10,300 | 17333352 |
| 649658 | Nov 21, 2007 | Nov 21, 2007 | Mariner Energy, Inc. | Frysak #2TM | 9,500 | 17333357 |
| 649104 | Nov 15, 2007 | Nov 15, 2007 | Range Production Company | Edmondson #1829 | 8,800 | 17333355 |
| 649103 | Nov 13, 2007 | Nov 13, 2007 | Range Production Company | Edmondson A #2919 | 8,850 | 17333354 |
| 648511 | Oct 31, 2007 | Oct 31, 2007 | Page Operating, LLC | Poe #1 | 10,500 | 17333353 |
| 648260 | Oct 29, 2007 | Oct 29, 2007 | Orbit Crude, Inc. | Glass #1 | 8,000 | 17330441 |
| 648260Amendment | Oct 29, 2007 | Oct 29, 2007 | Orbit Crude, Inc. | Glass #1 | 10,300 | 17330441 |
| 648260Amendment | Oct 29, 2007 | Oct 29, 2007 | Orbit Crude, Inc. | Glass #1 | 10,300 | 17330441 |
| 647676 | Oct 19, 2007 | Oct 19, 2007 | Merit Energy Company | Boone, K. S. #4 | 11,350 | 17332017 |
| 647392 | Oct 17, 2007 | Oct 17, 2007 | Legacy Reserves Operating LP | Exilde #2 | 7,300 | 17331753 |
| 646404 | Oct 15, 2007 | Oct 15, 2007 | Endeavor Energy Resources L.P. | Earhart "34" #1 | 12,000 | 17333142 |
| 646627 | Sep 28, 2007 | Sep 28, 2007 | Range Production Company | Allein A #3534 | 8,550 | 17332274 |
| 646603 | Sep 27, 2007 | Sep 27, 2007 | Rutter and Wilbanks Corporation | Connie #1 | 10,500 | 17333351 |
| 645612 | Sep 10, 2007 | Sep 10, 2007 | Manhattan Petroleum, Inc. | Rape, Mary #1 | 10,900 | 17331564 |
| 645108 | Aug 29, 2007 | Aug 29, 2007 | Chevron U. S. A. Inc. | Glasscock Fee #1 | 8,500 | 17333350 |
| 644820 | Aug 23, 2007 | Aug 23, 2007 | Pioneer Natural Res. USA, Inc. | Bailey #4 | 10,000 | 17333346 |
| 644820Amendment | Aug 23, 2007 | Aug 23, 2007 | Pioneer Natural Res. USA, Inc. | Bailey #4 | 10,500 | 17333346 |
| 644820Amendment | Aug 23, 2007 | Aug 23, 2007 | Pioneer Natural Res. USA, Inc. | Bailey #4 | 10,500 | 17333346 |
| 644820Amendment | Aug 23, 2007 | Aug 23, 2007 | Pioneer Natural Res. USA, Inc. | Bailey #4 | 10,500 | 17333346 |
| 644819 | Aug 23, 2007 | Aug 23, 2007 | Pioneer Natural Res. USA, Inc. | Cook, E "A" #3 | 10,000 | 17333348 |
| 644819Amendment | Aug 23, 2007 | Aug 23, 2007 | Pioneer Natural Res. USA, Inc. | Cook, E "A" #3 | 10,000 | 17333348 |
| 644818 | Aug 23, 2007 | Aug 23, 2007 | Pioneer Natural Res. USA, Inc. | Cook, E "A" #2 | 10,000 | 17333347 |
| 644795 | Aug 23, 2007 | Aug 23, 2007 | Range Production Company | Edmondson A #2829 | 9,300 | 17333345 |
| 638456 | Aug 22, 2007 | Aug 22, 2007 | Atmos Energy Corp., Mid-Tex Div. | GB X-275 #275 | 500 | 17333349 |
| 643845 | Aug 17, 2007 | Aug 17, 2007 | Manhattan Petroleum, Inc. | Sheri #1 | 10,000 | 17333181 |
| 643807 | Aug 13, 2007 | Aug 13, 2007 | Endeavor Energy Resources L.P. | Earhart "34A" #1 | 12,000 | 17333343 |
| 638540 | Aug 13, 2007 | Aug 13, 2007 | Pioneer Natural Res. USA, Inc. | Lane, W. H. "42" #8 | 9,800 | 17333318 |
| 643979 | Aug 11, 2007 | Aug 11, 2007 | Pioneer Natural Res. USA, Inc. | TXL W #2 | 10,000 | 17333344 |
| 643833 | Aug 10, 2007 | Aug 10, 2007 | Henry Petroleum LP | Currie "E" #3107 | 10,500 | 17333255 |
| 643737 | Aug 10, 2007 | Aug 10, 2007 | Pioneer Natural Res. USA, Inc. | Fowler 'A' #4 | 10,000 | 17333341 |
| 643737Amendment | Aug 10, 2007 | Aug 10, 2007 | Pioneer Natural Res. USA, Inc. | Fowler 'A' #4 | 10,000 | 17333341 |
| 643741 | Aug 9, 2007 | Aug 9, 2007 | Pioneer Natural Res. USA, Inc. | Stone "45" #1 | 10,200 | 17333342 |
| 643741Amendment | Aug 9, 2007 | Aug 9, 2007 | Pioneer Natural Res. USA, Inc. | Stone "45" #1 | 10,200 | 17333342 |
| 643729 | Aug 9, 2007 | Aug 9, 2007 | Pioneer Natural Res. USA, Inc. | Fowler 'A' #2 | 10,000 | 17333340 |
| 643729Amendment | Aug 9, 2007 | Aug 9, 2007 | Pioneer Natural Res. USA, Inc. | Fowler 'A' #2 | 10,000 | 17333340 |
| 643585 | Aug 9, 2007 | Aug 9, 2007 | Griffin Petroleum Company | N.A.C. #1 | 1,800 | 17333339 |
| 643542 | Aug 7, 2007 | Aug 7, 2007 | Henry Petroleum LP | Currie #3508 | 10,000 | 17333163 |
| 640185 | Aug 2, 2007 | Aug 2, 2007 | Pioneer Natural Res. USA, Inc. | Schrock, W. M. "26" #15 | 10,500 | 17333334 |
| 640184 | Aug 2, 2007 | Aug 2, 2007 | Pioneer Natural Res. USA, Inc. | Lane, W. H. "42" #7 | 9,800 | 17333333 |
| 640183 | Aug 2, 2007 | Aug 2, 2007 | Pioneer Natural Res. USA, Inc. | Black, SE "42" #8 | 9,800 | 17333332 |
| 642493 | Jul 26, 2007 | Jul 26, 2007 | Pioneer Natural Res. USA, Inc. | Schwertner "9" #1 | 10,500 | 17333338 |
| 641514 | Jul 11, 2007 | Jul 11, 2007 | Endeavor Energy Resources L.P. | Garrett "34" #1 | 12,000 | 17333337 |
| 638542 | Jul 5, 2007 | Jul 5, 2007 | Pioneer Natural Res. USA, Inc. | Schrock, W. M. "24" #16 | 9,800 | 17333320 |
| 638541 | Jul 5, 2007 | Jul 5, 2007 | Pioneer Natural Res. USA, Inc. | Schrock, W. M. "24" #14 | 9,800 | 17333319 |
| 638539 | Jul 5, 2007 | Jul 5, 2007 | Pioneer Natural Res. USA, Inc. | Lane, W. H. "37" #16 | 9,800 | 17333317 |
| 638535 | Jul 5, 2007 | Jul 5, 2007 | Pioneer Natural Res. USA, Inc. | Lane, W. H. "37" #14 | 9,800 | 17333316 |
| 638538 | Jul 3, 2007 | Jul 3, 2007 | Pioneer Natural Res. USA, Inc. | Lane, WH "37" #15 | 9,800 | 17333327 |
| 638197 | Jun 27, 2007 | Jun 27, 2007 | Pioneer Natural Res. USA, Inc. | Black, SE "42" #7 | 10,000 | 17333311 |
| 640473 | Jun 19, 2007 | Jun 19, 2007 | Range Production Company | Allein "A" #4028 | 8,650 | 17332297 |
| 640275 | Jun 14, 2007 | Jun 14, 2007 | Range Production Company | Edmondson A #2320 | 8,779 | 17333240 |
| 640252 | Jun 14, 2007 | Jun 14, 2007 | Pioneer Natural Res. USA, Inc. | Houston, Fred "B" #1 | 11,000 | 17333336 |
| 640252Amendment | Jun 14, 2007 | Jun 14, 2007 | Pioneer Natural Res. USA, Inc. | Houston, Fred "B" #1 | 11,000 | 17333336 |
| 640249 | Jun 14, 2007 | Jun 14, 2007 | Pioneer Natural Res. USA, Inc. | Houston Ranch "12" #2 | 10,500 | 17333335 |
| 640086 | Jun 14, 2007 | Jun 14, 2007 | McClure Oil Company, Inc. | Glass 45-A #1 | 7,300 | 17333331 |
| 639991 | Jun 11, 2007 | Jun 11, 2007 | Pioneer Natural Res. USA, Inc. | Fowler "A" #3 | 10,500 | 17333330 |
| 639989 | Jun 11, 2007 | Jun 11, 2007 | Pioneer Natural Res. USA, Inc. | Fowler "A" #1 | 10,500 | 17333329 |