| Abaco Operating, LLC |
000894 |
| Acock/Anaqua Operating Co., LP |
003599 |
| Allegro Investments, Inc. |
013305 |
| Alta Mesa Services, LP |
015721 |
| American Shoreline, Inc. |
019365 |
| Americo Energy Resources, LLC |
019752 |
| Ampak Oil Company |
020463 |
| A.O.E. Operators, Inc. |
000555 |
| Apache Corporation |
027200 |
| Aurora Resources Corporation |
036931 |
| Barrett Brothers Oil & Gas, Inc. |
053106 |
| B D Production Co., Inc. |
040190 |
| Beach Oil & Gas, Inc. |
058921 |
| Bettis, Boyle & Stovall |
068360 |
| Big Lake Corporation |
069458 |
| Block "T" Petroleum, Inc. |
075784 |
| Blue Wing Energy, Inc. |
076791 |
| B.P. Productions Inc. |
040797 |
| Bse Production Co. |
104965 |
| Capital Star Oil & Gas, Inc. |
130426 |
| Caskids Operating Company |
139584 |
| C & E Operating, Inc. |
120079 |
| Chaparral Energy, L.L.C. |
144535 |
| Charro Operating, L.L.C. |
146621 |
| Chesapeake Operating, L.L.C. |
147699 |
| Chevron Midcontinent, L.P. |
147862 |
| Cico Oil & Gas Company |
153410 |
| CML Exploration, LLC |
120648 |
| Coastal Plains Exploration, LLC |
161678 |
| Cordele Development Corporation |
178030 |
| Corum Production Company |
180197 |
| Crimson Exploration Oper., Inc. |
190005 |
| CTL Oil & Gas Corporation |
191826 |
| Cummins & Walker Oil Co., Inc. |
194215 |
| Dale Operating Company |
197624 |
| Devon Energy Production Co, L.P. |
216378 |
| Dewbre Petroleum Corporation |
216748 |
| Double Play Oil & Gas, Inc |
224880 |
| Durango Resources Corp. |
235945 |
| Ellsworth, H. P. O&G Properties |
249867 |
| Endeavor Natural Gas, LP |
251729 |
| Everest Resource Company |
252057 |
| Faulconer, Vernon E., Inc. |
263701 |
| Felderhoff Production Company |
265140 |
| Field Petroleum Corp. |
266906 |
| Finaly Resources LLC |
268323 |
| Finley Resources, Inc. |
268602 |
| Foundation Oil Company, Inc. |
280941 |
| Fredco |
284921 |
| Freddy'S Well Service, Inc. |
284929 |
| Frostwood Energy, LLC |
288391 |
| Gaither Petroleum Corporation |
292850 |
| Garrison LTD. |
295861 |
| Gasper Rice Resources, LTD. |
297089 |
| GBS Oil & Gas, LLC |
298357 |
| Geiser Operating, Inc. |
298984 |
| G E Operating, Inc. |
292166 |
| Hart Petroleum Services, Inc |
362869 |
| Heartland Production, Inc. |
370448 |
| Hilcorp Energy Company |
386310 |
| H-M Resource Management, Inc. |
341468 |
| Home Petroleum Corp. |
396852 |
| Houston Gulf Energy Corporation |
402723 |
| Hurd Enterprises, LTD. |
419886 |
| Inland Ocean, Inc. |
424607 |
| Iwr Operating, LLC |
427252 |
| Jad Oil, Inc. |
429555 |
| Janssen, Nelson |
429850 |
| Jet Oil Producers, Inc. |
432118 |
| JMM Energy LLC |
433110 |
| Kaler Energy Corp. |
450261 |
| Kebo Oil & Gas, Inc. |
453170 |
| Ken Petroleum Corporation |
455775 |
| Kirkpatrick, John Oil LLC |
468971 |
| Klotzman, M. S. Exploration Co. |
470566 |
| Magnum Producing, LP |
521516 |
| Mandarin Oil & Gas Company |
523885 |
| Marquee Corporation |
526675 |
| Marwell Petroleum LTD Partnrship |
531085 |
| McGowan Working Partners, Inc. |
549836 |
| Modern Exploration, Inc. |
573226 |
| Mse Operating Corp. |
592454 |
| Neumin Production Company |
605990 |
| New Century Exploration, Inc. |
606055 |
| New Source Oil & Gas, LLC |
608110 |
| Omega Alpha Resources, LLC |
622638 |
| Omimex Petroleum, Inc. |
622720 |
| Pegasus Operating, Inc. |
650621 |
| Petex |
659782 |
| Petra Oleum Corp. |
659826 |
| Petrodome Operating, LLC |
660286 |
| Pine Ridge Operating, L.P. |
665657 |
| Pintail Oil & Gas, LLC |
665697 |
| Pioneer Natural Res. USA, Inc. |
665748 |
| Premier Minerals, Inc. |
676033 |
| Proline Energy Resources Inc |
681327 |
| Property Development Group, Inc. |
681459 |
| Remora Management, LLC |
701560 |
| Reserve Operating Corp. |
703371 |
| Rincon Petroleum Corporation |
712336 |
| Rodeo Resources, L.L.C. |
723590 |
| Sanchez Oil & Gas Corporation |
747012 |
| S N D Energy Company, Inc. |
741084 |
| Stephens Production Company |
818425 |
| Stewardship Resources |
819614 |
| Stone, J. G. Oil Co. |
823421 |
| Strata Operating, Inc. |
825445 |
| Sue-Ann Operating, L.C. |
828352 |
| Sundown Energy LP |
829482 |
| Sydri Operating, LLC |
833597 |
| Taos Resources Operating Co LLC |
836010 |
| T-C Oil Company, LLC |
833782 |
| Tidal Petroleum, Inc. |
859240 |
| Top Op, L.L.C. |
862562 |
| TT Operating, LLC |
872252 |
| TX United Operating, LLC |
875158 |
| Union Gas Operating Company |
876500 |
| Unit Petroleum Company |
877099 |
| Urban Oil & Gas Group, LLC |
879035 |
| Valence Operating Company |
881167 |
| Walter Exploration Company |
895231 |
| White Oak Operating Company LLC |
916954 |
| Whiting Oil And Gas Corporation |
920478 |
| Wilcox Operating Corporation |
923280 |
| Williamson Oil & Gas, Inc. |
925909 |
| Wofford, C. J. |
935452 |
| Xog Operating LLC |
945921 |
| Zachry Exploration, LLC |
950468 |