| 619718 | May 31, 2006 | May 31, 2006 | Escondido Resources GP, LLC | Benavides #250535598 | 10,662 |
| 619718Amendment | May 31, 2006 | May 31, 2006 | Escondido Resources GP, LLC | Benavides #250535598 | 12,000 |
| 620048 | May 26, 2006 | May 26, 2006 | U.S. Enercorp, Ltd. | Vela-Lopeno #150535596 | 13,000 |
| 620048Amendment | May 26, 2006 | May 26, 2006 | U.S. Enercorp, Ltd. | Vela-Lopeno #150535596 | 13,200 |
| 620048Amendment | May 26, 2006 | May 26, 2006 | U.S. Enercorp, Ltd. | Vela-Lopeno #150535596 | 13,200 |
| 619991 | May 26, 2006 | May 26, 2006 | Synthetic Energy Corporation | Garcia, Anastacio #4HH50535595 | 300 |
| 619922 | May 25, 2006 | May 25, 2006 | Killam Oil Co., Ltd. | Hinnant 307 "C" #350535594 | 11,000 |
| 618187 | May 23, 2006 | May 23, 2006 | Chesapeake Operating, Inc. | Ramon #350535568 | 12,000 |
| 619446 | May 22, 2006 | May 22, 2006 | Conocophillips Company | Ruben Flores Minerals Ltd B #150535593 | 7,800 |
| 618147 | May 22, 2006 | May 22, 2006 | Houston Exploration Company, The | Garza, A. #2150535567 | 10,900 |
| 619598 | May 19, 2006 | May 19, 2006 | Houston Exploration Company, The | Garza, A. #2250535592 | 10,700 |
| 619549 | May 19, 2006 | May 19, 2006 | Chesapeake Operating, Inc. | Volpe #350535591 | 14,000 |
| 619547 | May 19, 2006 | May 19, 2006 | Chesapeake Operating, Inc. | J. Vela Cuellar #250535590 | 12,000 |
| 619495 | May 19, 2006 | May 19, 2006 | Newfield Exploration Company | 3J Zapata Ranches #150535589 | 13,000 |
| 619457 | May 18, 2006 | May 18, 2006 | Montecristo Exploration, Inc. | Lopez 'A' #150535588 | 4,200 |
| 617998 | May 17, 2006 | May 17, 2006 | Houston Exploration Company, The | Asche #11150535565 | 13,300 |
| 619360 | May 16, 2006 | May 16, 2006 | Newfield Exploration Company | Singer #250535587 | 15,000 |
| 619358 | May 16, 2006 | May 16, 2006 | Chesapeake Operating, Inc. | Guerra-Saenz #150535586 | 12,000 |
| 619231 | May 12, 2006 | May 12, 2006 | Laredo Energy | Dodier "C" #450535583 | 13,000 |
| 619090 | May 11, 2006 | May 11, 2006 | Houston Exploration Company, The | Maria Cuellar #1850535582 | 10,100 |
| 619036 | May 11, 2006 | May 11, 2006 | Chesapeake Operating, Inc. | Alexander #1050535581 | 14,000 |
| 619020 | May 10, 2006 | May 10, 2006 | Dominion Expl. & Prod., Inc. | Ramirez, Josefa #650535580 | 12,750 |
| 618516 | May 10, 2006 | May 10, 2006 | Legend Natural Gas II, LP | La Soledad #350535574 | 13,000 |
| 618516Amendment | May 10, 2006 | May 10, 2006 | Legend Natural Gas II, LP | La Soledad #350535574 | 13,000 |
| 618989 | May 9, 2006 | May 9, 2006 | Chesapeake Operating, Inc. | Gonzalez, Horacio #550535579 | 12,000 |
| 618871 | May 8, 2006 | May 8, 2006 | Laredo Energy | Haynes "A" #150535578 | 15,000 |
| 618861 | May 8, 2006 | May 8, 2006 | Chesapeake Operating, Inc. | Perez A #250535577 | 12,000 |
| 618778 | May 5, 2006 | May 5, 2006 | Ricochet Energy, Inc. | Flores #450535576 | 10,800 |
| 618725 | May 4, 2006 | May 4, 2006 | Chevron U. S. A. Inc. | Vela, J. M. #1650535575 | 9,700 |
| 618343 | May 3, 2006 | May 3, 2006 | Conocophillips Company | Ruben Flores Minerals Ltd GU #150535573 | 12,000 |
| 618343Amendment | May 3, 2006 | May 3, 2006 | Conocophillips Company | Ruben Flores Minerals Ltd GU #150535573 | 12,000 |
| 618532 | May 2, 2006 | May 2, 2006 | Chesapeake Operating, Inc. | Ramon #750535572 | 12,000 |
| 618502 | May 2, 2006 | May 2, 2006 | EOG Resources, Inc. | Slator Ranch #W 150535571 | 11,999 |
| 618397 | Apr 28, 2006 | Apr 28, 2006 | EOG Resources, Inc. | BMT/K&H "AC" #350535569 | 12,500 |
| 611898 | Apr 26, 2006 | Apr 26, 2006 | Chesapeake Operating, Inc. | Snavely #350535465 | 13,000 |
| 618042 | Apr 24, 2006 | Apr 24, 2006 | Chesapeake Operating, Inc. | Alejo Benavides #250535566 | 12,000 |
| 616472 | Apr 24, 2006 | Apr 24, 2006 | Conocophillips Company | Laurel Mineral Estate #1850535550 | 12,800 |
| 616472Amendment | Apr 24, 2006 | Apr 24, 2006 | Conocophillips Company | Laurel Mineral Estate #1850535550 | 12,800 |
| 617985 | Apr 21, 2006 | Apr 21, 2006 | Reichmann Petroleum Corp. | Hinojosa #150535563 | 12,000 |
| 617985Amendment | Apr 21, 2006 | Apr 21, 2006 | Reichmann Petroleum Corp. | Hinojosa #150535563 | 16,500 |
| 617984 | Apr 21, 2006 | Apr 21, 2006 | Montecristo Exploration, Inc. | Lopez #D 150535562 | 3,500 |
| 617983 | Apr 21, 2006 | Apr 21, 2006 | Montecristo Exploration, Inc. | Lopez #B 150535564 | 3,500 |
| 616004 | Apr 21, 2006 | Apr 21, 2006 | Conocophillips Company | Laurel Mineral Estate #1750535541 | 12,700 |
| 616242 | Apr 19, 2006 | Apr 19, 2006 | Houston Exploration Company, The | Abel Ramirez #1050535545 | 9,500 |
| 616236 | Apr 19, 2006 | Apr 19, 2006 | Houston Exploration Company, The | Abel Ramirez #950535544 | 9,500 |
| 615802 | Apr 19, 2006 | Apr 19, 2006 | Conocophillips Company | Laurel Mineral Estate #1550535536 | 12,600 |
| 617767 | Apr 18, 2006 | Apr 18, 2006 | Laredo Energy | Talbert "A" #150535561 | 12,000 |
| 617594 | Apr 13, 2006 | Apr 13, 2006 | Chesapeake Operating, Inc. | LFT #350535560 | 13,000 |
| 617559 | Apr 13, 2006 | Apr 13, 2006 | Dominion Expl. & Prod., Inc. | Guerra, Raul #1850535559 | 11,600 |
| 617414 | Apr 13, 2006 | Apr 13, 2006 | Dominion Expl. & Prod., Inc. | Munoz, Fernando #950535557 | 12,000 |
| 617414Amendment | Apr 13, 2006 | Apr 13, 2006 | Dominion Expl. & Prod., Inc. | Munoz, Fernando #950535557 | 12,000 |
| 617470 | Apr 12, 2006 | Apr 12, 2006 | Peoples Energy Prod.-TX, L.P. | Guerra "M" #650535558 | 11,000 |
| 617470Amendment | Apr 12, 2006 | Apr 12, 2006 | Peoples Energy Prod.-TX, L.P. | Guerra "M" #650535558 | 11,000 |
| 617401 | Apr 12, 2006 | Apr 12, 2006 | Wagner Oil Company | Slator Ranch #3350535556 | 12,500 |
| 617401Amendment | Apr 12, 2006 | Apr 12, 2006 | Wagner Oil Company | Slator Ranch #33ST50535556 | 12,500 |
| 617183 | Apr 7, 2006 | Apr 7, 2006 | Shell Western E&P | Hinojosa, G. G. #1650535555 | 18,315 |
| 616869 | Apr 6, 2006 | Apr 6, 2006 | Houston Exploration Company, The | Leonardo #250531116 | 11,000 |
| 616869Amendment | Apr 6, 2006 | Apr 6, 2006 | Houston Exploration Company, The | Leonardo #250531116 | 11,000 |
| 616838 | Apr 3, 2006 | Apr 3, 2006 | Killam Oil Co., Ltd. | M. G. Garza Gas Unit #350535554 | 12,820 |
| 616838Amendment | Apr 3, 2006 | Apr 3, 2006 | Killam Oil Co., Ltd. | M. G. Garza Gas Unit #350535554 | 11,895 |
| 616813 | Mar 31, 2006 | Mar 31, 2006 | Chesapeake Operating, Inc. | Romero Vasquez #550535553 | 14,000 |
| 615209 | Mar 30, 2006 | Mar 30, 2006 | Chesapeake Operating, Inc. | Villarreal #850535528 | 13,000 |
| 616659 | Mar 29, 2006 | Mar 29, 2006 | Chesapeake Operating, Inc. | Singer B #250535552 | 14,000 |
| 616624 | Mar 29, 2006 | Mar 29, 2006 | Ricochet Energy, Inc. | Villarreal #150535551 | 11,000 |
| 615222 | Mar 29, 2006 | Mar 29, 2006 | Houston Exploration Company, The | Munoz-Gutierrez Gas Unit #650535527 | 14,400 |
| 616583 | Mar 28, 2006 | Mar 28, 2006 | Conocophillips Company | La Perla B1 #2350535549 | 10,600 |
| 616446 | Mar 27, 2006 | Mar 27, 2006 | Chesapeake Operating, Inc. | O. M. Laurel Estate #1150535548 | 15,000 |
| 616438 | Mar 24, 2006 | Mar 24, 2006 | Legend Natural Gas II, LP | Whittier #250535547 | 12,000 |
| 616432 | Mar 24, 2006 | Mar 24, 2006 | Chesapeake Operating, Inc. | Leo Cuellar Gas Unit #250535546 | 14,000 |
| 616007 | Mar 23, 2006 | Mar 23, 2006 | Conocophillips Company | La Perla #25550535543 | 10,850 |
| 616001 | Mar 23, 2006 | Mar 23, 2006 | Conocophillips Company | Laurel Mineral Estate #1650535542 | 12,400 |
| 616001Amendment | Mar 23, 2006 | Mar 23, 2006 | Conocophillips Company | Laurel Mineral Estate #1650535542 | 12,400 |
| 616054 | Mar 20, 2006 | Mar 20, 2006 | Newfield Exploration Company | Volpe, Adan #250535540 | 13,000 |
| 616054Amendment | Mar 20, 2006 | Mar 20, 2006 | Newfield Exploration Company | Volpe, Adan #250535540 | 13,000 |
| 616020 | Mar 17, 2006 | Mar 17, 2006 | EOG Resources, Inc. | Slator Ranch #T 150535539 | 12,500 |
| 615970 | Mar 16, 2006 | Mar 16, 2006 | Houston Exploration Company, The | M. Flores #1450535538 | 13,800 |
| 615598 | Mar 16, 2006 | Mar 16, 2006 | Devon Energy Production Co, L.P. | Haynes #950532359 | 14,600 |
| 615890 | Mar 15, 2006 | Mar 15, 2006 | Laredo Energy | El Clareno #450535537 | 14,000 |
| 615890Amendment | Mar 15, 2006 | Mar 15, 2006 | Laredo Energy | El Clareno #450535537 | 14,000 |
| 615878 | Mar 15, 2006 | Mar 15, 2006 | Laredo Energy | Martinez-Uribe #350535535 | 11,000 |
| 615616 | Mar 15, 2006 | Mar 15, 2006 | Devon Energy Production Co, L.P. | Haynes #2950534799 | 14,560 |
| 615483 | Mar 15, 2006 | Mar 15, 2006 | Conocophillips Company | De Barberio #550535534 | 10,695 |
| 615483Amendment | Mar 15, 2006 | Mar 15, 2006 | Conocophillips Company | De Barberio #550535534 | 10,695 |
| 613940 | Mar 14, 2006 | Mar 14, 2006 | Houston Exploration Company, The | Asche #11050535504 | 13,800 |
| 613940Amendment | Mar 14, 2006 | Mar 14, 2006 | Houston Exploration Company, The | Asche #11050535504 | 13,800 |
| 614869 | Mar 13, 2006 | Mar 13, 2006 | Conocophillips Company | La Perla Cathodic #20650535533 | 350 |
| 614104 | Mar 13, 2006 | Mar 13, 2006 | Houston Exploration Company, The | L. Garza Estate #550535506 | 12,000 |
| 613463 | Mar 10, 2006 | Mar 10, 2006 | Conocophillips Company | McAskill TR7 #3250535501 | 12,600 |
| 615596 | Mar 9, 2006 | Mar 9, 2006 | EOG Resources, Inc. | Garza, L. #3850535532 | 12,500 |
| 615519 | Mar 9, 2006 | Mar 9, 2006 | EOG Resources, Inc. | Benavides Mineral Trust #750535531 | 10,000 |
| 615346 | Mar 9, 2006 | Mar 9, 2006 | Devon Energy Production Co, L.P. | Haynes-North #750535529 | 9,600 |
| 615346Amendment | Mar 9, 2006 | Mar 9, 2006 | Devon Energy Production Co, L.P. | Haynes-North #750535529 | 9,600 |
| 614505 | Mar 9, 2006 | Mar 9, 2006 | Devon Energy Production Co, L.P. | Haynes-North #650535516 | 12,000 |
| 615408 | Mar 8, 2006 | Mar 8, 2006 | Peoples Energy Prod.-TX, L.P. | Vela B #850535530 | 10,600 |
| 615408Amendment | Mar 8, 2006 | Mar 8, 2006 | Peoples Energy Prod.-TX, L.P. | Vela B #850535530 | 10,600 |
| 615389 | Mar 8, 2006 | Mar 8, 2006 | Edge Petroleum Oper. Co., Inc. | Tomasa #150533260 | 9,740 |
| 614519 | Mar 6, 2006 | Mar 6, 2006 | Devon Energy Production Co, L.P. | Haynes-North #850535517 | 15,000 |
| 615226 | Mar 3, 2006 | Mar 3, 2006 | Laredo Energy | Zachry #250535526 | 11,000 |
| 615226Amendment | Mar 3, 2006 | Mar 3, 2006 | Laredo Energy | Zachry #250535526 | 11,000 |
| 615211 | Mar 3, 2006 | Mar 3, 2006 | Chesapeake Operating, Inc. | Horacio Gonzalez #450535525 | 12,000 |