| 641369 | Jul 6, 2007 | Jul 6, 2007 | Indexgeo & Associates, Inc. | Polk | Baker #1 | 3,000 | 37331096 |
| 633733 | Feb 26, 2007 | Feb 26, 2007 | Indexgeo & Associates, Inc. | Grimes | Blackstone #1 | 4,750 | 18530713 |
| 630933 | Dec 27, 2006 | Dec 27, 2006 | Indexgeo & Associates, Inc. | Colorado | Leyendecker #3 | 2,500 | 08932516 |
| 605819 | Sep 7, 2005 | Sep 7, 2005 | Indexgeo & Associates, Inc. | Fayette | Hajovsky Gas Unit #1 | 6,500 | 14933154 |
| 560685 | Aug 22, 2005 | Aug 22, 2005 | Indexgeo & Associates, Inc. | Waller | Sempra Energy #1 | 6,200 | 47330970 |
| 604951 | Aug 15, 2005 | Aug 15, 2005 | Indexgeo & Associates, Inc. | Grimes | Shanahan Gas Unit #1 | 4,400 | 18530699 |
| 604951Amendment | Aug 15, 2005 | Aug 15, 2005 | Indexgeo & Associates, Inc. | Grimes | Shanahan Gas Unit #1 | 4,400 | 18530699 |
| 551939 | Oct 7, 2004 | Oct 7, 2004 | Indexgeo & Associates, Inc. | Jackson | Clark Gas Unit #01 | 4,500 | 23933282 |
| 551938 | Oct 7, 2004 | Oct 7, 2004 | Indexgeo & Associates, Inc. | Lavaca | Nolen/Jensen Gas Unit #01 | 4,500 | 28533107 |
| 544824 | Apr 28, 2004 | Apr 28, 2004 | Indexgeo & Associates, Inc. | Jasper | Teel, et Al #2 | 4,200 | 24130707 |
| 544824Amendment | Apr 28, 2004 | Apr 28, 2004 | Indexgeo & Associates, Inc. | Jasper | Teel, et Al #2 | 4,200 | 24130707 |
| 539819 | Dec 22, 2003 | Dec 22, 2003 | Indexgeo & Associates, Inc. | Jasper | Teel #1 | 4,200 | 24130705 |
| 523408 | Sep 6, 2002 | Sep 6, 2002 | Indexgeo & Associates, Inc. | Austin | Lindemann #1 | 6,600 | 01530824 |
| 523407 | Sep 6, 2002 | Sep 6, 2002 | Indexgeo & Associates, Inc. | Austin | Spiess #1 | 4,000 | 01530823 |
| 513689 | Sep 21, 2001 | Sep 21, 2001 | Indexgeo & Associates, Inc. | Wharton | Ilse-Miller Gas Unit #1 | 4,500 | 48134409 |
| 504576 | Feb 27, 2001 | Feb 27, 2001 | Indexgeo & Associates, Inc. | Colorado | Wooten-Sanderson Gas Unit #2 | 4,600 | 08932280 |
| 495626 | Jun 2, 2000 | Jun 2, 2000 | Indexgeo & Associates, Inc. | Colorado | Potter #1 | 5,300 | 08932223 |
| 488942 | Oct 29, 1999 | Oct 29, 1999 | Indexgeo & Associates, Inc. | Colorado | Isgrig #1 | 4,650 | 08932179 |
| 485954 | Jul 20, 1999 | Jul 20, 1999 | Indexgeo & Associates, Inc. | Colorado | Richard R. Obenhaus Gas Unit #3 | 7,800 | 08932159 |
| 484886 | Jun 7, 1999 | Jun 7, 1999 | Indexgeo & Associates, Inc. | Colorado | Obenhaus #2 | 5,200 | 08932144 |
| 484886Amendment | Jun 7, 1999 | Jun 7, 1999 | Indexgeo & Associates, Inc. | Colorado | Obenhaus Gas Unit #2 | 5,200 | 08932144 |
| 484887 | Jun 2, 1999 | Jun 2, 1999 | Indexgeo & Associates, Inc. | Colorado | Obenhaus #1 | 5,000 | 08932145 |
| 484887Amendment | Jun 2, 1999 | Jun 2, 1999 | Indexgeo & Associates, Inc. | Colorado | Obenhaus #1 | 5,200 | 08932145 |
| 476946 | Jun 10, 1998 | Jun 10, 1998 | Indexgeo & Associates, Inc. | Lavaca | New-Henderson Gas Unit #1 | 7,300 | 28532615 |
| 476946Amendment | Jun 10, 1998 | Jun 10, 1998 | Indexgeo & Associates, Inc. | Lavaca | New-Henderson Gas Unit #1 | 4,094 | 28532615 |
| 472455 | Jan 22, 1998 | Jan 22, 1998 | Indexgeo & Associates, Inc. | Lavaca | Krejci "a" Gas Unit #1 | 4,150 | 28532570 |
| 469422 | Nov 4, 1997 | Nov 4, 1997 | Indexgeo & Associates, Inc. | Lavaca | Lawrence Gas Unit #1 | 7,150 | 28532549 |
| 465538 | Jul 29, 1997 | Jul 29, 1997 | Indexgeo & Associates, Inc. | Colorado | Glasscock, C. G. #1 | 5,200 | 08932055 |
| 448174 | May 16, 1996 | May 16, 1996 | Indexgeo & Associates, Inc. | Colorado | Wooton-Sanderson Gas Unit #1 | 5,200 | 08931974 |
| 443950 | Jan 25, 1996 | Jan 25, 1996 | Indexgeo & Associates, Inc. | Goliad | Wells #1 | 4,200 | 17532892 |
| 441246 | Nov 20, 1995 | Nov 20, 1995 | Indexgeo & Associates, Inc. | Wharton | Raun #1 | 3,100 | 48133835 |
| 437259 | Jul 27, 1995 | Jul 27, 1995 | Indexgeo & Associates, Inc. | Victoria | Zmeskal #3 | 3,400 | 46933093 |
| 437229 | Jun 29, 1995 | Jun 29, 1995 | Indexgeo & Associates, Inc. | Victoria | Zmeskal #2 | 3,900 | 46933092 |
| 435797 | May 25, 1995 | May 25, 1995 | Indexgeo & Associates, Inc. | Lavaca | Konvicka #2 | 4,000 | 28532310 |
| 435104 | Apr 24, 1995 | Apr 24, 1995 | Indexgeo & Associates, Inc. | Lavaca | Wagner, Woodrow et Al #1 | 2,650 | 28532305 |
| 435104Amendment | Apr 24, 1995 | Apr 24, 1995 | Indexgeo & Associates, Inc. | Lavaca | Wagner, Woodrow et Al #1 | 2,650 | 28532305 |
| 434328 | Mar 31, 1995 | Mar 31, 1995 | Indexgeo & Associates, Inc. | Lavaca | Schindler Unit #1 | 7,600 | 28532301 |
| 428881 | Oct 10, 1994 | Oct 10, 1994 | Indexgeo & Associates, Inc. | Lavaca | Parr Gas Unit #1 | 7,500 | 28532271 |
| 427515 | Sep 6, 1994 | Sep 6, 1994 | Indexgeo & Associates, Inc. | Lavaca | Krejci Gas Unit #1 | 4,050 | 28532266 |
| 425964 | Jul 21, 1994 | Jul 21, 1994 | Indexgeo & Associates, Inc. | Lavaca | Pilgreen "A" #2 | 3,500 | 28532254 |
| 424540 | Jul 13, 1994 | Jul 13, 1994 | Indexgeo & Associates, Inc. | Victoria | Leeper #1 | 3,500 | 46933041 |
| 424149 | May 26, 1994 | May 26, 1994 | Indexgeo & Associates, Inc. | Lavaca | Konvicka Gas Unit #1 | 7,300 | 28532247 |
| 417928 | Jan 25, 1994 | Jan 25, 1994 | Indexgeo & Associates, Inc. | Victoria | Zmeskal #1 | 3,850 | 46933004 |
| 419738 | Dec 30, 1993 | Dec 30, 1993 | Indexgeo & Associates, Inc. | Lavaca | Pilgreen "a" #1 #1 | 5,900 | 28532227 |
| 416939 | Nov 18, 1993 | Nov 18, 1993 | Indexgeo & Associates, Inc. | Colorado | Jones #1 | 3,500 | 08931885 |
| 414541 | Aug 9, 1993 | Aug 9, 1993 | Indexgeo & Associates, Inc. | Lavaca | Pilgreen Gas Unit #1 | 6,000 | 28532203 |
| 413667 | Jul 12, 1993 | Jul 12, 1993 | Indexgeo & Associates, Inc. | Austin | Best, G.U. #1 | 4,300 | 01530645 |
| 406210 | Nov 20, 1992 | Nov 20, 1992 | Indexgeo & Associates, Inc. | Goliad | Shelton "a" Gas Unit #1 | 4,200 | 17532680 |
| 404614 | Oct 15, 1992 | Oct 15, 1992 | Indexgeo & Associates, Inc. | Jackson | Wearden #1 | 3,000 | 23932665 |
| 403669 | Sep 22, 1992 | Sep 22, 1992 | Indexgeo & Associates, Inc. | De Witt | Matthews Gas Unit #1 | 3,000 | 12331712 |
| 403055 | Sep 4, 1992 | Sep 4, 1992 | Indexgeo & Associates, Inc. | Jackson | Garner Gas Unit #1 | 4,000 | 23932659 |
| 402379 | Aug 18, 1992 | Aug 18, 1992 | Indexgeo & Associates, Inc. | Lavaca | Sartwelle Gas Unit #1 | 3,400 | 28532158 |
| 399676 | Jun 30, 1992 | Jun 30, 1992 | Indexgeo & Associates, Inc. | Colorado | Underwood #1 | 1,600 | 08931853 |
| 395369 | Feb 9, 1992 | Feb 9, 1992 | Indexgeo & Associates, Inc. | De Witt | Schrade Gas Unit #1 | 3,100 | 12331703 |
| 394771 | Dec 9, 1991 | Dec 9, 1991 | Indexgeo & Associates, Inc. | Victoria | Fishbeck Gas Unit #1 | 3,600 | 46932887 |
| 361029 | Aug 2, 1989 | Aug 2, 1989 | Indexgeo & Associates, Inc. | Victoria | Wolf #1 | 3,400 | 46932671 |
| 352907 | Nov 22, 1988 | Nov 22, 1988 | Indexgeo & Associates, Inc. | Victoria | Wolf #1 | 3,200 | 46932671 |
| 22812 | Apr 25, 1978 | Apr 25, 1978 | Indexgeo & Associates, Inc. | Bee | Farish, S. P. #1 | 3,125 | 02530971 |