| 531796Amendment | May 14, 2003 | May 14, 2003 | Southwestern Energy Prod. Co. | Smith | Arnold Gas Unit 1 #6 | 11,900 | 42331646 |
| 531798 | May 13, 2003 | May 13, 2003 | Southwestern Energy Prod. Co. | Smith | Kickapoo Creek Gas Unit 1 #6 | 12,000 | 42331648 |
| 531797 | May 13, 2003 | May 13, 2003 | Southwestern Energy Prod. Co. | Smith | Milton Anderson Gas Unit 1 #6 | 12,000 | 42331647 |
| 530994 | Apr 24, 2003 | Apr 24, 2003 | Southwestern Energy Prod. Co. | Smith | Jasper Wilson Gas Unit 1 #6 | 12,200 | 42331642 |
| 530595 | Apr 11, 2003 | Apr 11, 2003 | Southwestern Energy Prod. Co. | Smith | McRimmon Gas Unit 1 #4 | 12,200 | 42331641 |
| 530558 | Apr 10, 2003 | Apr 10, 2003 | Southwestern Energy Prod. Co. | Smith | McRimmon Gas Unit 1 #3 | 12,200 | 42331639 |
| 530449 | Apr 8, 2003 | Apr 8, 2003 | Southwestern Energy Prod. Co. | Smith | Wright Gas Unit #2 | 11,900 | 42331638 |
| 530192 | Apr 1, 2003 | Apr 1, 2003 | Southwestern Energy Prod. Co. | Smith | Milton Anderson Gas Unit 1 #5 | 12,000 | 42331635 |
| 530191 | Apr 1, 2003 | Apr 1, 2003 | Southwestern Energy Prod. Co. | Smith | Arnold Gas Unit 1 #5 | 11,900 | 42331634 |
| 529546 | Mar 13, 2003 | Mar 13, 2003 | Southwestern Energy Prod. Co. | Smith | Jasper Wilson Gas Unit 1 #5 | 12,200 | 42331630 |
| 529250 | Mar 11, 2003 | Mar 11, 2003 | Southwestern Energy Prod. Co. | Smith | McRimmon Gas Unit 1 #2 | 12,300 | 42331627 |
| 527162 | Feb 21, 2003 | Feb 21, 2003 | Southwestern Energy Prod. Co. | Smith | Woolf Gas Unit 1 #5 | 12,100 | 42331607 |
| 528304 | Feb 10, 2003 | Feb 10, 2003 | Southwestern Energy Prod. Co. | Smith | Arnold Gas Unit 2 #4 | 12,700 | 42331623 |
| 528304Amendment | Feb 10, 2003 | Feb 10, 2003 | Southwestern Energy Prod. Co. | Smith | Arnold Gas Unit 2 #4 | 12,700 | 42331623 |
| 528303 | Feb 10, 2003 | Feb 10, 2003 | Southwestern Energy Prod. Co. | Smith | Perry Gas Unit 1 #4 | 12,300 | 42331622 |
| 528302 | Feb 10, 2003 | Feb 10, 2003 | Southwestern Energy Prod. Co. | Smith | Bright Gas Unit 1 #4 | 12,300 | 42331621 |
| 528050 | Feb 4, 2003 | Feb 4, 2003 | Southwestern Energy Prod. Co. | Smith | Allred Gas Unit 1 #5 | 12,200 | 42331620 |
| 527368 | Jan 16, 2003 | Jan 16, 2003 | Southwestern Energy Prod. Co. | Smith | Waldrop Gas Unit 1 #3 | 12,500 | 42331616 |
| 527366 | Jan 16, 2003 | Jan 16, 2003 | Southwestern Energy Prod. Co. | Smith | P. M. Wilson Heirs Gas Unit 1 #4 | 12,000 | 42331614 |
| 527165 | Jan 10, 2003 | Jan 10, 2003 | Southwestern Energy Prod. Co. | Smith | Jackson Gas Unit 1 #1 | 12,000 | 42331608 |
| 527164 | Jan 10, 2003 | Jan 10, 2003 | Southwestern Energy Prod. Co. | Smith | Milton Anderson Gas Unit #4 | 12,100 | 42331609 |
| 527163 | Jan 10, 2003 | Jan 10, 2003 | Southwestern Energy Prod. Co. | Smith | Bright Gas Unit 1 #3 | 12,700 | 42331610 |
| 526534 | Dec 27, 2002 | Dec 27, 2002 | Southwestern Energy Prod. Co. | Smith | Arnold Gas Unit 2 #3 | 12,000 | 42331605 |
| 526534Amendment | Dec 27, 2002 | Dec 27, 2002 | Southwestern Energy Prod. Co. | Smith | Arnold Gas Unit 2 #3 | 12,000 | 42331605 |
| 526633 | Dec 23, 2002 | Dec 23, 2002 | Southwestern Energy Prod. Co. | Crane | Cowden Ranch "50" #1 | 6,600 | 10334913 |
| 526633Amendment | Dec 23, 2002 | Dec 23, 2002 | Southwestern Energy Prod. Co. | Crane | Cowden Ranch "50" #1 | 6,600 | 10334913 |
| 526505 | Dec 20, 2002 | Dec 20, 2002 | Southwestern Energy Prod. Co. | Smith | McRimmon Gas Unit 1 #1 | 12,300 | 42331604 |
| 526505Amendment | Dec 20, 2002 | Dec 20, 2002 | Southwestern Energy Prod. Co. | Smith | McRimmon Gas Unit 1 #1 | 12,300 | 42331604 |
| 526542 | Dec 19, 2002 | Dec 19, 2002 | Southwestern Energy Prod. Co. | Anderson | Hill Heirs #1 | 11,400 | 00132406 |
| 526542Amendment | Dec 19, 2002 | Dec 19, 2002 | Southwestern Energy Prod. Co. | Anderson | Hill Heirs #1 | 11,400 | 00132406 |
| 525108 | Dec 16, 2002 | Dec 16, 2002 | Southwestern Energy Prod. Co. | Smith | Milton Anderson Gas Unit 1 #3 | 12,100 | 42331593 |
| 526298 | Dec 12, 2002 | Dec 12, 2002 | Southwestern Energy Prod. Co. | Smith | J. F. Ware Gas Unit 1 #4 | 12,300 | 42331602 |
| 526298Amendment | Dec 12, 2002 | Dec 12, 2002 | Southwestern Energy Prod. Co. | Smith | J. F. Ware Gas Unit 1 #4 | 12,300 | 42331602 |
| 526297 | Dec 12, 2002 | Dec 12, 2002 | Southwestern Energy Prod. Co. | Smith | Jasper Wilson Gas Unit 1 #4 | 12,250 | 42331601 |
| 526296 | Dec 12, 2002 | Dec 12, 2002 | Southwestern Energy Prod. Co. | Smith | J. F. Ware Gas Unit 1 #5 | 12,700 | 42331603 |
| 526232 | Dec 10, 2002 | Dec 10, 2002 | Southwestern Energy Prod. Co. | Smith | Grady Wilson Gas Unit 1 #3 | 12,500 | 42331599 |
| 526230 | Dec 10, 2002 | Dec 10, 2002 | Southwestern Energy Prod. Co. | Smith | Jerry Cross Gas Unit 1 #2 | 12,200 | 42331598 |
| 525497 | Nov 25, 2002 | Nov 25, 2002 | Southwestern Energy Prod. Co. | Smith | Allred Gas Unit 1 #4 | 12,400 | 42331595 |
| 525434 | Nov 15, 2002 | Nov 15, 2002 | Southwestern Energy Prod. Co. | Smith | P. M. Wilson Heirs Gas Unit 1 #3 | 11,900 | 42331594 |
| 523653 | Sep 17, 2002 | Sep 17, 2002 | Southwestern Energy Prod. Co. | Smith | Woolf Gas Unit 1 #4 | 12,000 | 42331590 |
| 523652 | Sep 17, 2002 | Sep 17, 2002 | Southwestern Energy Prod. Co. | Smith | Jasper Wilson Gas Unit 1 #3 | 12,300 | 42331589 |
| 523651 | Sep 17, 2002 | Sep 17, 2002 | Southwestern Energy Prod. Co. | Smith | Sallie Warren Heirs Gas Unit 1 #3 | 12,600 | 42331588 |
| 522944 | Aug 20, 2002 | Aug 20, 2002 | Southwestern Energy Prod. Co. | Smith | Arnold Gas Unit 1 #4 | 11,900 | 42331586 |
| 522943 | Aug 20, 2002 | Aug 20, 2002 | Southwestern Energy Prod. Co. | Smith | Milton Anderson Gas Unit 1 #2 | 12,000 | 42331585 |
| 522217 | Jul 31, 2002 | Jul 31, 2002 | Southwestern Energy Prod. Co. | Smith | Jasper Wilson Gas Unit 1 #2 | 12,300 | 42331584 |
| 521865 | Jul 22, 2002 | Jul 22, 2002 | Southwestern Energy Prod. Co. | Smith | Perry Gas Unit 1 #3 | 12,300 | 42331583 |
| 521459 | Jun 28, 2002 | Jun 28, 2002 | Southwestern Energy Prod. Co. | Yoakum | Fraser #2 | 11,886 | 50133273 |
| 520235 | May 22, 2002 | May 22, 2002 | Southwestern Energy Prod. Co. | Smith | Vernon B. Wilson Gas Unit 1 #4 | 12,200 | 42331578 |
| 520234 | May 22, 2002 | May 22, 2002 | Southwestern Energy Prod. Co. | Smith | Carrie Matlock Gas Unit 1 #4 | 12,200 | 42331577 |
| 519596 | May 1, 2002 | May 1, 2002 | Southwestern Energy Prod. Co. | Smith | Waldrop Gas Unit 1 #2 | 12,400 | 42331576 |
| 518653 | Mar 28, 2002 | Mar 28, 2002 | Southwestern Energy Prod. Co. | Smith | Kickapoo Creek Gas Unit 1 #4 | 12,200 | 42331575 |
| 518547 | Mar 28, 2002 | Mar 28, 2002 | Southwestern Energy Prod. Co. | Smith | Jerry Cross Gas Unit 1 #1 | 12,500 | 42331574 |
| 518554 | Mar 25, 2002 | Mar 25, 2002 | Southwestern Energy Prod. Co. | Smith | Woolf Gas Unit 1 #3 | 12,000 | 42331573 |
| 518554Amendment | Mar 25, 2002 | Mar 25, 2002 | Southwestern Energy Prod. Co. | Smith | Woolf Gas Unit 1 #3 | 12,000 | 42331573 |
| 518467 | Mar 21, 2002 | Mar 21, 2002 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch Co. -K- #40 | 5,285 | 13130771 |
| 518173 | Mar 8, 2002 | Mar 8, 2002 | Southwestern Energy Prod. Co. | Smith | Milton Anderson Gas Unit 1 #1 | 11,900 | 42331571 |
| 517111 | Jan 25, 2002 | Jan 25, 2002 | Southwestern Energy Prod. Co. | Smith | Frank Burke Gas Unit 1 #3 | 12,200 | 42331569 |
| 517111Amendment | Jan 25, 2002 | Jan 25, 2002 | Southwestern Energy Prod. Co. | Smith | Frank Burke Gas Unit 1 #3 | 12,055 | 42331569 |
| 516808 | Jan 14, 2002 | Jan 14, 2002 | Southwestern Energy Prod. Co. | Crane | Cowden Ranch "58" #1 | 8,100 | 10334881 |
| 515917 | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Smith | Vernon B. Wilson Gas Unit 1 #3 | 12,100 | 42331567 |
| 515916 | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Smith | Grady Wilson Gas Unit No. 1 #2 | 12,600 | 42331565 |
| 515915 | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Smith | Allred Gas Unit 1 #3 | 12,300 | 42331564 |
| 515914 | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Smith | Jasper Wilson Gas Unit 1 #1 | 12,400 | 42331566 |
| 515914Amendment | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Smith | Wilson, Jasper #1 | 12,400 | 42331566 |
| 515914Amendment | Dec 14, 2001 | Dec 14, 2001 | Southwestern Energy Prod. Co. | Smith | Jasper Wilson Gas Unit 1 #1 | 12,400 | 42331566 |
| 515913Amendment | Dec 11, 2001 | Dec 11, 2001 | Dewbre Petroleum Corporation | Nueces | State Tract 433 #1 | 10,545 | 35533437 |
| 512465 | Sep 27, 2001 | Sep 27, 2001 | Southwestern Energy Prod. Co. | Smith | P. M. Wilson Heirs Unit 1 #2 | 11,800 | 42331561 |
| 513426 | Sep 7, 2001 | Sep 7, 2001 | Southwestern Energy Prod. Co. | Smith | Carrie Matlock Gas Unit #1 #3 | 12,050 | 42331562 |
| 511695 | Sep 5, 2001 | Sep 5, 2001 | Southwestern Energy Prod. Co. | Smith | Bright Gas Unit 1 #2 | 12,005 | 42331559 |
| 512261 | Aug 7, 2001 | Aug 7, 2001 | Southwestern Energy Prod. Co. | Smith | J. F. Ware Gas Unit 1 #3 | 12,000 | 42331560 |
| 512284 | Aug 6, 2001 | Aug 6, 2001 | Southwestern Energy Prod. Co. | Crockett | ER "3" #1 | 9,200 | 10538738 |
| 510982 | Jul 9, 2001 | Jul 9, 2001 | Southwestern Energy Prod. Co. | Smith | Kickapoo Creek Gas Unit #3 | 11,850 | 42331555 |
| 510980 | Jul 9, 2001 | Jul 9, 2001 | Southwestern Energy Prod. Co. | Smith | Arnold Gas Unit 1 #3 | 11,800 | 42331556 |
| 509549 | May 30, 2001 | May 30, 2001 | Southwestern Energy Prod. Co. | Smith | Sallie M.warren Heirs Gas UNIT#1 #2 | 12,135 | 42331553 |
| 508921 | May 14, 2001 | May 14, 2001 | Southwestern Energy Prod. Co. | Crane | Cowden Ranch "48" #8 | 7,700 | 10334834 |
| 508921Amendment | May 14, 2001 | May 14, 2001 | Southwestern Energy Prod. Co. | Crane | Cowden Ranch "48" #8 | 7,700 | 10334834 |
| 508554 | May 4, 2001 | May 4, 2001 | Southwestern Energy Prod. Co. | Crane | Cowden "49" #1 | 9,100 | 10334831 |
| 507896 | Apr 19, 2001 | Apr 19, 2001 | Southwestern Energy Prod. Co. | Smith | Vernon B. Wilson Gas Unit 1 #2 | 11,900 | 42331549 |
| 507895 | Apr 19, 2001 | Apr 19, 2001 | Southwestern Energy Prod. Co. | Smith | Frank M. Burke Jr. Gas Unit 1 #2 | 11,950 | 42331548 |
| 507894 | Apr 19, 2001 | Apr 19, 2001 | Southwestern Energy Prod. Co. | Smith | Carrie Matlock Gas Unit 1 #2 | 11,900 | 42331547 |
| 507285 | Apr 2, 2001 | Apr 2, 2001 | Southwestern Energy Prod. Co. | Crane | Cowden Ranch "48" #7 | 7,800 | 10334795 |
| 505082 | Mar 27, 2001 | Mar 27, 2001 | Southwestern Energy Prod. Co. | Smith | Woolf Gas Unit #2 | 12,500 | 42331542 |
| 506294 | Mar 12, 2001 | Mar 12, 2001 | Southwestern Energy Prod. Co. | Smith | J. F. Ware Gas Unit 1 #2 | 11,900 | 42331544 |
| 504477 | Jan 24, 2001 | Jan 24, 2001 | Southwestern Energy Prod. Co. | Glasscock | Schwartz #1 | 8,000 | 17333052 |
| 503521 | Dec 28, 2000 | Dec 28, 2000 | Southwestern Energy Prod. Co. | Crane | Cowden Ranch 48 #7 | 7,800 | 10334795 |
| 501907 | Nov 13, 2000 | Nov 13, 2000 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch -K- #60 | 1,600 | 13137397 |
| 493615 | Mar 29, 2000 | Mar 29, 2000 | Southwestern Energy Prod. Co. | Duval | Cuellar, V. NO.2-a Gas Unit #2 | 7,973 | 13136932 |
| 493613 | Mar 29, 2000 | Mar 29, 2000 | Southwestern Energy Prod. Co. | Matagorda | Runnels Pasture Company #1 | 9,300 | 32131816 |
| 491180 | Jan 18, 2000 | Jan 18, 2000 | Southwestern Energy Prod. Co. | Nueces | Susser #2 | 8,304 | 35532377 |
| 488606 | Oct 18, 1999 | Oct 18, 1999 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch Co -K- #68 | 850 | 13138353 |
| 488606Amendment | Oct 18, 1999 | Oct 18, 1999 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch Co -K- #68 | 930 | 13138353 |
| 485833 | Jul 13, 1999 | Jul 13, 1999 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch Co. -K- #15D | 3,380 | 13120098 |
| 485831 | Jul 13, 1999 | Jul 13, 1999 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch Co. -K- #51 | 2,430 | 13137026 |
| 483623Amendment | May 12, 1999 | May 12, 1999 | Southwestern Energy Prod. Co. | Smith | Allred Gas Unit #1 #2 | 13,000 | 42331519 |
| 483652 | Apr 1, 1999 | Apr 1, 1999 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch Co. -K- #54 | 3,550 | 13137111 |
| 482320 | Jan 29, 1999 | Jan 29, 1999 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch Co. -K- #66 | 5,680 | 13137967 |
| 479436 | Sep 14, 1998 | Sep 14, 1998 | Southwestern Energy Prod. Co. | Duval | Dcrc #K 67 | 9,400 | 13138291 |
| 474580 | Mar 30, 1998 | Mar 30, 1998 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch -K- #60 | 1,860 | 13137397 |
| 474580Amendment | Mar 30, 1998 | Mar 30, 1998 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch -K- #60 | 1,860 | 13137397 |
| 471768 | Feb 24, 1998 | Feb 24, 1998 | Southwestern Energy Prod. Co. | Duval | Duval County Ranch Co. -K- #66 | 5,680 | 13137967 |