| 651086 | Dec 17, 2007 | Dec 17, 2007 | Range Production Company | Fowler Sawyer Trust Unit #1HH | 9,000 | 21730530 |
| 650663 | Dec 11, 2007 | Dec 11, 2007 | Endeavor Energy Resources L.P. | Presby #1HH | 10,000 | 21730529 |
| 650268 | Dec 5, 2007 | Dec 5, 2007 | Forest Oil Corporation | Green #2HH | 11,000 | 21730528 |
| 650245 | Dec 5, 2007 | Dec 5, 2007 | Quicksilver Resources Inc. | Jeans Unit #2HH | 9,000 | 21730527 |
| 649482 | Nov 16, 2007 | Nov 16, 2007 | EOG Resources, Inc. | Holasek Unit #1HH | 10,000 | 21730526 |
| 649482Amendment | Nov 16, 2007 | Nov 16, 2007 | EOG Resources, Inc. | Holasek Unit #1HH | 10,000 | 21730526 |
| 649482Amendment | Nov 16, 2007 | Nov 16, 2007 | EOG Resources, Inc. | Holasek Unit #1HH | 10,000 | 21730526 |
| 649065 | Nov 14, 2007 | Nov 14, 2007 | Aspect Energy, LLC | Dennis-Gerik #1HH | 9,800 | 21730525 |
| 649014 | Nov 12, 2007 | Nov 12, 2007 | Quicksilver Resources Inc. | Jeans Unit #1HH | 9,000 | 21730524 |
| 648745 | Nov 6, 2007 | Nov 6, 2007 | EOG Resources, Inc. | Mattox Unit #2 | 10,000 | 21730523 |
| 648581 | Nov 5, 2007 | Nov 5, 2007 | Range Production Company | Yancey #4HH | 9,000 | 21730522 |
| 648580 | Nov 5, 2007 | Nov 5, 2007 | Range Production Company | Yancey #3HH | 9,000 | 21730521 |
| 648526 | Oct 31, 2007 | Oct 31, 2007 | Range Production Company | Yancey #2HH | 9,000 | 21730520 |
| 648526Amendment | Oct 31, 2007 | Oct 31, 2007 | Range Production Company | Yancey #2HH | 9,000 | 21730520 |
| 648525 | Oct 31, 2007 | Oct 31, 2007 | Range Production Company | Yancey #1HH | 9,000 | 21730519 |
| 648525Amendment | Oct 31, 2007 | Oct 31, 2007 | Range Production Company | Yancey #1HH | 9,000 | 21730519 |
| 648046 | Oct 22, 2007 | Oct 22, 2007 | Forest Oil Corporation | Bearden #1HRH | 9,000 | 21730518 |
| 648029 | Oct 22, 2007 | Oct 22, 2007 | Quicksilver Resources Inc. | Goldsmith Hilton Unit #3HH | 9,000 | 21730517 |
| 647843 | Oct 18, 2007 | Oct 18, 2007 | Forest Oil Corporation | Ellison Estates Unit #4HH | 9,000 | 21730516 |
| 647559 | Oct 16, 2007 | Oct 16, 2007 | Quicksilver Resources Inc. | Frances Unit #2HH | 9,000 | 21730515 |
| 647556 | Oct 16, 2007 | Oct 16, 2007 | Quicksilver Resources Inc. | Frances Unit #1HH | 9,000 | 21730514 |
| 647467 | Oct 15, 2007 | Oct 15, 2007 | EOG Resources, Inc. | Brooks Unit #1HH | 10,000 | 21730513 |
| 647267 | Oct 10, 2007 | Oct 10, 2007 | Forest Oil Corporation | Green #1HH | 8,600 | 21730512 |
| 646743 | Sep 28, 2007 | Sep 28, 2007 | Quicksilver Resources Inc. | Goldsmith Hilton Unit #1HH | 9,000 | 21730510 |
| 646742 | Sep 28, 2007 | Sep 28, 2007 | Quicksilver Resources Inc. | Goldsmith Hilton Unit #2HH | 9,000 | 21730511 |
| 646139 | Sep 19, 2007 | Sep 19, 2007 | Range Production Company | Richardson "B" Unit #1HH | 9,000 | 21730508 |
| 646139Amendment | Sep 19, 2007 | Sep 19, 2007 | Range Production Company | Richardson "B" Unit #1HH | 9,000 | 21730508 |
| 646139Amendment | Sep 19, 2007 | Sep 19, 2007 | Range Production Company | Richardson "B" Unit #1HH | 9,000 | 21730508 |
| 646137 | Sep 19, 2007 | Sep 19, 2007 | Range Production Company | Richardson "a" Unit #1HH | 9,000 | 21730509 |
| 646032 | Sep 17, 2007 | Sep 17, 2007 | EOG Resources, Inc. | Joyce Unit #1HH | 10,000 | 21730507 |
| 645829 | Sep 14, 2007 | Sep 14, 2007 | Devon Energy Production Co, L.P. | Willis, Jerry #3HH | 9,000 | 21730506 |
| 645767 | Sep 13, 2007 | Sep 13, 2007 | Citrus Energy Corporation | Thuem Unit #1HBH | 9,000 | 21730505 |
| 645767Amendment | Sep 13, 2007 | Sep 13, 2007 | Citrus Energy Corporation | Thuem Unit #1HBH | 9,000 | 21730505 |
| 645250 | Aug 30, 2007 | Aug 30, 2007 | Cornerstone E & P Company, LP | Clark #2HH | 9,000 | 21730503 |
| 645244 | Aug 30, 2007 | Aug 30, 2007 | Cornerstone E & P Company, LP | Clark #1HH | 9,000 | 21730504 |
| 645021 | Aug 28, 2007 | Aug 28, 2007 | Cornerstone E & P Company, LP | Leach #2HH | 9,000 | 21730502 |
| 645018 | Aug 28, 2007 | Aug 28, 2007 | Cornerstone E & P Company, LP | Leach #1HH | 9,000 | 21730501 |
| 644580 | Aug 20, 2007 | Aug 20, 2007 | Forest Oil Corporation | Bearden #1HH | 9,000 | 21730500 |
| 644580Amendment | Aug 20, 2007 | Aug 20, 2007 | Forest Oil Corporation | Bearden #1HH | 9,000 | 21730500 |
| 644067 | Aug 15, 2007 | Aug 15, 2007 | EOG Resources, Inc. | Cynthia Unit #1HH | 9,000 | 21730499 |
| 644070 | Aug 13, 2007 | Aug 13, 2007 | EOG Resources, Inc. | Cynthia Unit #2HH | 9,000 | 21730498 |
| 643927 | Aug 10, 2007 | Aug 10, 2007 | Forest Oil Corporation | Ellison Estates Unit #3HH | 13,000 | 21730497 |
| 643560 | Aug 9, 2007 | Aug 9, 2007 | Sullivan, Hollis R. Inc. | Lopez #1HH | 8,500 | 21730495 |
| 643560Amendment | Aug 9, 2007 | Aug 9, 2007 | Sullivan, Hollis R. Inc. | Lopez #1HH | 8,900 | 21730495 |
| 641464 | Aug 7, 2007 | Aug 7, 2007 | Williams Prod. Gulf Coast, L.P. | Westbrook #1HH | 8,600 | 21730493 |
| 641520 | Jul 9, 2007 | Jul 9, 2007 | Quicksilver Resources Inc. | Uma Unit #2HH | 6,400 | 21730494 |
| 641520Amendment | Jul 9, 2007 | Jul 9, 2007 | Quicksilver Resources Inc. | Uma Unit #2HH | 9,000 | 21730494 |
| 640396 | Jun 15, 2007 | Jun 15, 2007 | Williams Prod. Gulf Coast, L.P. | Javeed #1HH | 8,600 | 21730492 |
| 640093 | Jun 13, 2007 | Jun 13, 2007 | Dte Gas Resources, Inc. | Landrum Unit #2HH | 8,700 | 21730490 |
| 640091 | Jun 13, 2007 | Jun 13, 2007 | Dte Gas Resources, Inc. | Landrum Unit #1HH | 8,700 | 21730489 |
| 638046 | Jun 13, 2007 | Jun 13, 2007 | Dte Gas Resources, Inc. | Burleson Unit #1HH | 8,700 | 21730491 |
| 640016 | Jun 11, 2007 | Jun 11, 2007 | Quicksilver Resources Inc. | East Cletus Unit #4HH | 6,400 | 21730488 |
| 640016Amendment | Jun 11, 2007 | Jun 11, 2007 | Quicksilver Resources Inc. | East Cletus Unit #4HH | 9,000 | 21730488 |
| 640015 | Jun 11, 2007 | Jun 11, 2007 | Quicksilver Resources Inc. | East Cletus Unit #3HH | 6,400 | 21730487 |
| 640015Amendment | Jun 11, 2007 | Jun 11, 2007 | Quicksilver Resources Inc. | East Cletus Unit #3HH | 9,000 | 21730487 |
| 640011 | Jun 11, 2007 | Jun 11, 2007 | Quicksilver Resources Inc. | East Cletus Unit #2HH | 6,400 | 21730486 |
| 640011Amendment | Jun 11, 2007 | Jun 11, 2007 | Quicksilver Resources Inc. | East Cletus Unit #2HH | 9,000 | 21730486 |
| 640000 | Jun 11, 2007 | Jun 11, 2007 | Quicksilver Resources Inc. | Sideshow Bob Unit #4HH | 6,400 | 21730485 |
| 640000Amendment | Jun 11, 2007 | Jun 11, 2007 | Quicksilver Resources Inc. | Sideshow Bob Unit #4HH | 7,197 | 21730485 |
| 639646 | May 31, 2007 | May 31, 2007 | Range Production Company | Richardson #2HH | 9,000 | 21730484 |
| 639646Amendment | May 31, 2007 | May 31, 2007 | Range Production Company | Richardson #2HH | 9,000 | 21730484 |
| 639645 | May 31, 2007 | May 31, 2007 | Range Production Company | Rogers, Rosemary #1HH | 9,000 | 21730483 |
| 639635 | May 31, 2007 | May 31, 2007 | Devon Energy Production Co, L.P. | Gene Harris Ranch #1HH | 9,000 | 21730482 |
| 637656 | May 29, 2007 | May 29, 2007 | EOG Resources, Inc. | Mayfield Unit #2HH | 9,000 | 21730475 |
| 639423 | May 25, 2007 | May 25, 2007 | EOG Resources, Inc. | Mary McQuagge Unit #1HH | 9,000 | 21730481 |
| 637663 | May 24, 2007 | May 24, 2007 | EOG Resources, Inc. | Mayfield Unit #3HH | 9,000 | 21730476 |
| 639113 | May 21, 2007 | May 21, 2007 | EOG Resources, Inc. | Holden Unit #3HH | 9,000 | 21730477 |
| 639113Amendment | May 21, 2007 | May 21, 2007 | EOG Resources, Inc. | Holden Unit #3HH | 10,000 | 21730477 |
| 638953 | May 21, 2007 | May 21, 2007 | Range Production Company | Richardson #1HH | 8,700 | 21730478 |
| 638953Amendment | May 21, 2007 | May 21, 2007 | Range Production Company | Richardson #1HH | 9,000 | 21730478 |
| 638762 | May 21, 2007 | May 21, 2007 | Quicksilver Resources Inc. | Cecil Terwilliger Unit #2HH | 6,400 | 21730480 |
| 638762Amendment | May 21, 2007 | May 21, 2007 | Quicksilver Resources Inc. | Cecil Terwilliger Unit #2HH | 9,000 | 21730480 |
| 638759 | May 21, 2007 | May 21, 2007 | Quicksilver Resources Inc. | Cecil Terwilliger Unit #1HH | 6,400 | 21730479 |
| 638759Amendment | May 21, 2007 | May 21, 2007 | Quicksilver Resources Inc. | Cecil Terwilliger Unit #1HH | 9,000 | 21730479 |
| 638815 | May 18, 2007 | May 18, 2007 | EOG Resources, Inc. | Mattox Unit #1HH | 8,500 | 21730474 |
| 638815Amendment | May 18, 2007 | May 18, 2007 | EOG Resources, Inc. | Mattox Unit #1HH | 10,000 | 21730474 |
| 638330 | May 15, 2007 | May 15, 2007 | EOG Resources, Inc. | Mayfield Unit #5HH | 9,000 | 21730472 |
| 638319 | May 15, 2007 | May 15, 2007 | EOG Resources, Inc. | Mayfield Unit #4HH | 9,000 | 21730471 |
| 638469 | May 11, 2007 | May 11, 2007 | Quicksilver Resources Inc. | East Cletus Unit #1HH | 7,800 | 21730473 |
| 638469Amendment | May 11, 2007 | May 11, 2007 | Quicksilver Resources Inc. | East Cletus Unit #1HH | 7,800 | 21730473 |
| 637638 | May 2, 2007 | May 2, 2007 | EOG Resources, Inc. | Kimbrell Unit #5HH | 9,000 | 21730469 |
| 637628 | May 1, 2007 | May 1, 2007 | EOG Resources, Inc. | Kimbrell Unit #4HH | 9,000 | 21730470 |
| 637617 | Apr 30, 2007 | Apr 30, 2007 | Quicksilver Resources Inc. | Flanders, Ned #1HH | 6,600 | 21730468 |
| 637617Amendment | Apr 30, 2007 | Apr 30, 2007 | Quicksilver Resources Inc. | Flanders, Ned #1HH | 9,000 | 21730468 |
| 637333 | Apr 26, 2007 | Apr 26, 2007 | Westside Energy Op. Co., LP | Ellison Estates #2HH | 11,000 | 21730467 |
| 636986 | Apr 18, 2007 | Apr 18, 2007 | EOG Resources, Inc. | Mayfield Unit #1HH | 9,000 | 21730466 |
| 636725 | Apr 14, 2007 | Apr 14, 2007 | Star of Texas Energy Srvs, Inc. | McPherson B #1HH | 9,000 | 21730465 |
| 636479 | Apr 12, 2007 | Apr 12, 2007 | Williams Prod. Gulf Coast, L.P. | Staples Javeed #1 HH | 8,700 | 21730464 |
| 636479Amendment | Apr 12, 2007 | Apr 12, 2007 | Williams Prod. Gulf Coast, L.P. | Staples Javeed #1 HH | 8,700 | 21730464 |
| 636479Amendment | Apr 12, 2007 | Apr 12, 2007 | Williams Prod. Gulf Coast, L.P. | Staples Javeed #1 HH | 8,700 | 21730464 |
| 636126 | Mar 28, 2007 | Mar 28, 2007 | Westside Energy Op. Co., LP | Primula South #2HH | 11,000 | 21730463 |
| 635492 | Mar 27, 2007 | Mar 27, 2007 | EOG Resources, Inc. | Strickland Unit #1HH | 9,000 | 21730462 |
| 635489 | Mar 26, 2007 | Mar 26, 2007 | EOG Resources, Inc. | Radke Unit #4HH | 9,000 | 21730461 |
| 635487 | Mar 26, 2007 | Mar 26, 2007 | EOG Resources, Inc. | Radke Unit #3HH | 9,000 | 21730460 |
| 635486 | Mar 26, 2007 | Mar 26, 2007 | EOG Resources, Inc. | Radke Unit #2HH | 9,000 | 21730459 |
| 635264 | Mar 22, 2007 | Mar 22, 2007 | EOG Resources, Inc. | Holden Unit #2HH | 9,000 | 21730458 |
| 635145 | Mar 20, 2007 | Mar 20, 2007 | EOG Resources, Inc. | Gordon SWD #1 | 13,500 | 21730457 |
| 635145Amendment | Mar 20, 2007 | Mar 20, 2007 | EOG Resources, Inc. | Gordon SWD #1 | 14,500 | 21730457 |
| 634145 | Mar 2, 2007 | Mar 2, 2007 | EOG Resources, Inc. | Burt Trust Unit #4HH | 9,000 | 21730456 |
| 634145Amendment | Mar 2, 2007 | Mar 2, 2007 | EOG Resources, Inc. | Burt Trust Unit #4HH | 10,000 | 21730456 |