| 662933 | Jun 12, 2008 | Jun 12, 2008 | Burlington Resources O & G Co LP | Leito Unit #1HH | 9,000 | 22131671 |
| 662916 | Jun 12, 2008 | Jun 12, 2008 | Burlington Resources O & G Co LP | Boggs Unit #4HH | 9,000 | 22131670 |
| 662916Amendment | Jun 12, 2008 | Jun 12, 2008 | Burlington Resources O & G Co LP | Boggs Unit #4HH | 9,000 | 22131670 |
| 662877 | Jun 12, 2008 | Jun 12, 2008 | Burlington Resources O & G Co LP | Boggs Unit #3HH | 9,000 | 22131669 |
| 662877Amendment | Jun 12, 2008 | Jun 12, 2008 | Burlington Resources O & G Co LP | Boggs Unit #3HH | 9,000 | 22131669 |
| 662875 | Jun 12, 2008 | Jun 12, 2008 | Burlington Resources O & G Co LP | Boggs Unit #2HH | 9,000 | 22131674 |
| 662872 | Jun 12, 2008 | Jun 12, 2008 | Burlington Resources O & G Co LP | Boggs Unit #1HH | 9,000 | 22131668 |
| 662553 | Jun 10, 2008 | Jun 10, 2008 | Quicksilver Resources Inc. | Keith Randle Estate #1HH | 9,000 | 22131667 |
| 662025 | Jun 4, 2008 | Jun 4, 2008 | Quicksilver Resources Inc. | Rodrigo-Jake O. Kinnard Unit #3HH | 9,000 | 22131664 |
| 662023 | Jun 4, 2008 | Jun 4, 2008 | Quicksilver Resources Inc. | Mary Ann Unit #6HH | 9,000 | 22131665 |
| 662022 | Jun 4, 2008 | Jun 4, 2008 | Quicksilver Resources Inc. | Mary Ann Unit #5HH | 9,000 | 22131666 |
| 662021 | Jun 4, 2008 | Jun 4, 2008 | Quicksilver Resources Inc. | Rodrigo-Jake O. Kinnard Unit #2HH | 9,000 | 22131663 |
| 662018 | Jun 4, 2008 | Jun 4, 2008 | Quicksilver Resources Inc. | Rodrigo-Jake O. Kinnard Unit #1HH | 9,000 | 22131662 |
| 661960 | Jun 3, 2008 | Jun 3, 2008 | Burlington Resources O & G Co LP | Randle "a" Unit #15HH | 9,000 | 22131661 |
| 661902 | Jun 2, 2008 | Jun 2, 2008 | Range Production Company | Henson Unit #4HH | 9,000 | 22131660 |
| 661901 | Jun 2, 2008 | Jun 2, 2008 | Range Production Company | Henson Unit #3HH | 9,000 | 22131659 |
| 661582 | May 29, 2008 | May 29, 2008 | Range Production Company | Mitchell Ranch #22HH | 9,000 | 22131658 |
| 661515 | May 27, 2008 | May 27, 2008 | Range Production Company | Mitchell Ranch #21HH | 9,000 | 22131657 |
| 661433 | May 23, 2008 | May 23, 2008 | Quicksilver Resources Inc. | Gibbs Unit #5HH | 9,000 | 22131656 |
| 661391 | May 23, 2008 | May 23, 2008 | EOG Resources, Inc. | Houston Ranch #24HH | 5,700 | 22131655 |
| 661237 | May 22, 2008 | May 22, 2008 | Burlington Resources O & G Co LP | West Granbury #2HH | 9,000 | 22131654 |
| 661235 | May 22, 2008 | May 22, 2008 | Burlington Resources O & G Co LP | West Granbury #1HH | 9,000 | 22131653 |
| 661235Amendment | May 22, 2008 | May 22, 2008 | Burlington Resources O & G Co LP | West Granbury Unit #1HH | 5,550 | 22131653 |
| 661191 | May 22, 2008 | May 22, 2008 | XTO Energy Inc. | Ballard Unit #1HH | 9,000 | 22131652 |
| 661182 | May 22, 2008 | May 22, 2008 | XTO Energy Inc. | Ballard Unit #3HH | 9,000 | 22131651 |
| 660987 | May 20, 2008 | May 20, 2008 | EOG Resources, Inc. | Houston Ranch #23HH | 5,700 | 22131650 |
| 660894 | May 20, 2008 | May 20, 2008 | Quicksilver Resources Inc. | Professor Unit #6HH | 9,000 | 22131645 |
| 660892 | May 20, 2008 | May 20, 2008 | Quicksilver Resources Inc. | Professor Unit #5HH | 9,000 | 22131643 |
| 660886 | May 20, 2008 | May 20, 2008 | Quicksilver Resources Inc. | Mary Ann Unit #4HH | 9,000 | 22131641 |
| 660885 | May 20, 2008 | May 20, 2008 | Quicksilver Resources Inc. | Mary Ann Unit #3HH | 9,000 | 22131639 |
| 660897 | May 19, 2008 | May 19, 2008 | EOG Resources, Inc. | Versfelt Unit #3HH | 10,000 | 22131646 |
| 660896 | May 19, 2008 | May 19, 2008 | EOG Resources, Inc. | Versfelt Unit #2HH | 10,000 | 22131644 |
| 660889 | May 19, 2008 | May 19, 2008 | Quicksilver Resources Inc. | Professor Unit #4HH | 9,000 | 22131642 |
| 660887 | May 19, 2008 | May 19, 2008 | Quicksilver Resources Inc. | Professor Unit #3HH | 9,000 | 22131640 |
| 660872 | May 19, 2008 | May 19, 2008 | EOG Resources, Inc. | Black Ranch #A 19HH | 6,000 | 22131638 |
| 660871 | May 19, 2008 | May 19, 2008 | EOG Resources, Inc. | Black Ranch #A 18HH | 6,000 | 22131637 |
| 660459 | May 13, 2008 | May 13, 2008 | Burlington Resources O & G Co LP | Crowell C Unit #3HH | 9,000 | 22131635 |
| 660359 | May 9, 2008 | May 9, 2008 | EOG Resources, Inc. | Black Ranch #A 8HH | 6,000 | 22131636 |
| 660412 | May 8, 2008 | May 8, 2008 | EOG Resources, Inc. | Black Ranch #W 2HH | 5,600 | 22131634 |
| 660411 | May 8, 2008 | May 8, 2008 | EOG Resources, Inc. | Black Ranch #W 1HH | 5,600 | 22131633 |
| 660408 | May 8, 2008 | May 8, 2008 | EOG Resources, Inc. | Black Ranch #W 6HH | 5,600 | 22131632 |
| 660361 | May 8, 2008 | May 8, 2008 | EOG Resources, Inc. | Black Ranch #A 9HH | 6,000 | 22131631 |
| 660327 | May 7, 2008 | May 7, 2008 | Quicksilver Resources Inc. | Radar #5HH | 9,000 | 22131630 |
| 660327Amendment | May 7, 2008 | May 7, 2008 | Quicksilver Resources Inc. | Radar #5HH | 9,000 | 22131630 |
| 659908 | May 1, 2008 | May 1, 2008 | Quicksilver Resources Inc. | Silver Bullet Unit #6HH | 9,000 | 22131629 |
| 659906 | May 1, 2008 | May 1, 2008 | Quicksilver Resources Inc. | Silver Bullet Unit #5HH | 9,000 | 22131625 |
| 659903 | May 1, 2008 | May 1, 2008 | Quicksilver Resources Inc. | Silver Bullet Unit #4HH | 9,000 | 22131628 |
| 659893 | May 1, 2008 | May 1, 2008 | Quicksilver Resources Inc. | Silver Bullet Unit #3HH | 9,000 | 22131627 |
| 659891 | May 1, 2008 | May 1, 2008 | Quicksilver Resources Inc. | Silver Bullet Unit #2HH | 9,000 | 22131626 |
| 659889 | May 1, 2008 | May 1, 2008 | Quicksilver Resources Inc. | Silver Bullet Unit #1HH | 9,000 | 22131624 |
| 640005Amendment | Apr 30, 2008 | Apr 30, 2008 | Quicksilver Resources Inc. | Yosemite Sam Unit #2HH | 6,400 | 22131396 |
| 640005Amendment | Apr 30, 2008 | Apr 30, 2008 | Quicksilver Resources Inc. | Yosemite Sam Unit #2HH | 6,400 | 22131396 |
| 659678 | Apr 28, 2008 | Apr 28, 2008 | Burlington Resources O & G Co LP | Randle "a" Unit #9HH | 9,000 | 22131622 |
| 659669 | Apr 28, 2008 | Apr 28, 2008 | Burlington Resources O & G Co LP | Randle "a" Unit #8HH | 9,000 | 22131623 |
| 659441 | Apr 26, 2008 | Apr 26, 2008 | EOG Resources, Inc. | Black Ranch #W 8HH | 5,600 | 22131621 |
| 659101 | Apr 23, 2008 | Apr 23, 2008 | EOG Resources, Inc. | Houston Ranch #21HH | 5,800 | 22131618 |
| 658495 | Apr 17, 2008 | Apr 17, 2008 | Chesapeake Operating, Inc. | Vermont Hares Ear #5HH | 9,000 | 22131619 |
| 658494 | Apr 17, 2008 | Apr 17, 2008 | Chesapeake Operating, Inc. | Vermont Hares Ear #4HH | 9,000 | 22131620 |
| 658494Amendment | Apr 17, 2008 | Apr 17, 2008 | Chesapeake Operating, Inc. | Vermont Hares Ear #4HH | 9,000 | 22131620 |
| 658599 | Apr 14, 2008 | Apr 14, 2008 | Chesapeake Operating, Inc. | Vermont Hares Ear #3HH | 9,000 | 22131617 |
| 658599Amendment | Apr 14, 2008 | Apr 14, 2008 | Chesapeake Operating, Inc. | Vermont Hares Ear #3HH | 9,000 | 22131617 |
| 658533 | Apr 12, 2008 | Apr 12, 2008 | EOG Resources, Inc. | Black Ranch #A 20 | 9,500 | 22131616 |
| 651410Amendment | Apr 11, 2008 | Apr 11, 2008 | EOG Resources, Inc. | Black Ranch #A 6HH | 6,000 | 22131563 |
| 657414 | Mar 26, 2008 | Mar 26, 2008 | Quicksilver Resources Inc. | Radar #4HH | 6,600 | 22131615 |
| 657414Amendment | Mar 26, 2008 | Mar 26, 2008 | Quicksilver Resources Inc. | Radar #4HH | 6,600 | 22131615 |
| 657156 | Mar 24, 2008 | Mar 24, 2008 | Burlington Resources O & G Co LP | Coates B Unit #4HH | 9,000 | 22131610 |
| 657153 | Mar 24, 2008 | Mar 24, 2008 | Burlington Resources O & G Co LP | Coates a Unit #3HH | 9,000 | 22131609 |
| 657150 | Mar 24, 2008 | Mar 24, 2008 | Burlington Resources O & G Co LP | Coates a Unit #2HH | 9,000 | 22131608 |
| 657150Amendment | Mar 24, 2008 | Mar 24, 2008 | Burlington Resources O & G Co LP | Coates a Unit #2HH | 9,000 | 22131608 |
| 657126 | Mar 24, 2008 | Mar 24, 2008 | Quicksilver Resources Inc. | Luker-Hammer Unit #5HH | 6,600 | 22131607 |
| 657124 | Mar 24, 2008 | Mar 24, 2008 | Quicksilver Resources Inc. | Blue Duck #1HH | 6,600 | 22131612 |
| 657070 | Mar 21, 2008 | Mar 21, 2008 | Quicksilver Resources Inc. | Luker-Hammer Unit #4HH | 6,600 | 22131614 |
| 657067 | Mar 21, 2008 | Mar 21, 2008 | Quicksilver Resources Inc. | Luker-Hammer Unit #3HH | 6,600 | 22131611 |
| 657065 | Mar 21, 2008 | Mar 21, 2008 | Quicksilver Resources Inc. | Luker-Hammer Unit #2HH | 6,600 | 22131613 |
| 657064 | Mar 21, 2008 | Mar 21, 2008 | Burlington Resources O & G Co LP | Triple Creek "C" #3HH | 9,000 | 22131605 |
| 657061 | Mar 21, 2008 | Mar 21, 2008 | Quicksilver Resources Inc. | Luker-Hammer Unit #1HH | 6,600 | 22131604 |
| 657054 | Mar 21, 2008 | Mar 21, 2008 | EOG Resources, Inc. | Black Ranch #W 7HH | 6,000 | 22131603 |
| 656932 | Mar 20, 2008 | Mar 20, 2008 | Burlington Resources O & G Co LP | Comanche Peak #9HH | 9,000 | 22131602 |
| 656921 | Mar 19, 2008 | Mar 19, 2008 | Burlington Resources O & G Co LP | Comanche Peak #8HH | 9,000 | 22131606 |
| 656149 | Mar 7, 2008 | Mar 7, 2008 | Quicksilver Resources Inc. | Gibbs Unit #3HH | 6,600 | 22131600 |
| 656151 | Mar 6, 2008 | Mar 6, 2008 | Quicksilver Resources Inc. | Gibbs Unit #4HH | 6,600 | 22131601 |
| 655911 | Mar 5, 2008 | Mar 5, 2008 | Burlington Resources O & G Co LP | Randle "a" Unit #11HH | 9,000 | 22131599 |
| 655908 | Mar 5, 2008 | Mar 5, 2008 | Burlington Resources O & G Co LP | Randle "a" Unit #10HH | 9,000 | 22131598 |
| 655474 | Feb 28, 2008 | Feb 28, 2008 | Quicksilver Resources Inc. | Shipley Unit #2HH | 6,600 | 22131594 |
| 655477 | Feb 27, 2008 | Feb 27, 2008 | Quicksilver Resources Inc. | Hoover Unit #12HH | 6,600 | 22131597 |
| 655475 | Feb 26, 2008 | Feb 26, 2008 | Quicksilver Resources Inc. | Hoover Unit #10HH | 6,600 | 22131595 |
| 655476 | Feb 25, 2008 | Feb 25, 2008 | Quicksilver Resources Inc. | Hoover Unit #11HH | 6,600 | 22131596 |
| 655471 | Feb 25, 2008 | Feb 25, 2008 | Quicksilver Resources Inc. | Shipley Unit #1HH | 6,600 | 22131593 |
| 654882 | Feb 20, 2008 | Feb 20, 2008 | Range Production Company | Mitchell Ranch #26HH | 9,000 | 22131590 |
| 654948 | Feb 19, 2008 | Feb 19, 2008 | Range Production Company | Henson Unit #2HH | 9,000 | 22131591 |
| 654947 | Feb 19, 2008 | Feb 19, 2008 | Range Production Company | Henson Unit #1HH | 9,000 | 22131592 |
| 654630 | Feb 13, 2008 | Feb 13, 2008 | EOG Resources, Inc. | Houston Ranch #22HH | 5,700 | 22131589 |
| 654386 | Feb 9, 2008 | Feb 9, 2008 | Quicksilver Resources Inc. | Hot Lips Unit #3HH | 6,600 | 22131587 |
| 654384 | Feb 9, 2008 | Feb 9, 2008 | Quicksilver Resources Inc. | Hot Lips Unit #2HH | 6,600 | 22131588 |
| 648186Amendment | Feb 9, 2008 | Feb 9, 2008 | Quicksilver Resources Inc. | Price Unit #8HH | 9,000 | 22131519 |
| 654360 | Feb 8, 2008 | Feb 8, 2008 | Devon Energy Production Co, L.P. | Brite #2HH | 9,000 | 22131586 |
| 654343 | Feb 8, 2008 | Feb 8, 2008 | Quicksilver Resources Inc. | Berlin SWD #1 | 10,000 | 22131585 |
| 653973 | Feb 4, 2008 | Feb 4, 2008 | Quicksilver Resources Inc. | Hoover SWD #1 | 9,500 | 22131584 |
| 653659 | Jan 31, 2008 | Jan 31, 2008 | Quicksilver Resources Inc. | Station Branch Ranch Unit #12HH | 6,600 | 22131575 |
| 653658 | Jan 31, 2008 | Jan 31, 2008 | Quicksilver Resources Inc. | Station Branch Ranch Unit #11HH | 6,600 | 22131576 |