| Duncan, Donald G-3-139926 | Spanish Camp (Yegua 6800) | Wharton | 1 | 6.81K | 1.02M | Jan 1993 – Dec 2018 |
| Duncan, Donald B. G-3-201045 | Spanish Camp, W. (4900) | Wharton | 1 | 0 | 464K | Apr 2004 – Dec 2018 |
| Duncan, Donald B. G-3-235584 | Spanish Camp, N. (4250) | Wharton | 1 | 0 | 175K | May 2008 – Dec 2018 |
| Duncan-Hamill G-3-189161 | Spanish Camp (Yegua 7200) | Wharton | 1 | 0 | 674K | May 2002 – Dec 2018 |
| Duncan, Donald B. G-3-196829 | Spanish Camp (Spanish Camp Lo.) | Wharton | 1 | 0 | 99.5K | Aug 2003 – Feb 2013 |
| Haidusek G-2-176317 | Holyfield Fan Man Sand (Yegua) | Lavaca | 1 | 2.22K | 706K | Jan 2000 – Jul 2010 |
| Haidusek G-2-212184 | Holyfield Fan Man Sand (Yegua 1) | Lavaca | 1 | 0 | 210K | Apr 2005 – Jul 2010 |
| Kallus, Johnny G-2-224622 | Jack Starr (Frio 4410) | Jackson | 1 | 0 | 221K | Jan 2007 – Mar 2009 |
| Rose and Sample G-2-149114 | Jack Starr (Yegua Y-4) | Jackson | 1 | 38.2K | 5.27M | Apr 1994 – Jan 2009 |
| Duncan, Donald B. G-3-235585 | Spanish Camp (Stray 2800) | Wharton | 1 | 0 | 52.7K | May 2008 – Dec 2008 |
| Hinze-Balusek G-3-203463 | Buck Snag (Frio 3770) | Colorado | 1 | 0 | 522K | Aug 2004 – Aug 2008 |
| Duncan, Donald B. G-3-202979 | Spanish Camp, W. (3950 Frio) | Wharton | 1 | 0 | 307K | Jul 2004 – Jul 2008 |
| Duncan, F. B. & D. "D" Lease G-3-180785 | Spanish Camp(spanish Camp 2900U) | Wharton | 1 | 0 | 6.45K | Jan 2001 – Feb 2008 |
| Quinn-Jolly Unit #1 G-2-226274 | Cordele, W. (3730) | Jackson | 1 | 0 | 77.9K | Apr 2007 – Nov 2007 |
| Duncan D Lease G-3-178938 | Spanish Camp(spanish Camp 2900U) | Wharton | 1 | 0 | 7.64K | Oct 2000 – Apr 2005 |
| Duncan -C- G-3-55417 | Spanish Camp(spanish Camp 2900U) | Wharton | 1 | 0 | 8.92K | May 1997 – Jun 2004 |
| Albrecht G-2-123040 | Albrecht Creek (Wilcox 9780) | Goliad | 1 | 983 | 145K | Jan 1993 – Jul 2003 |
| Duncan, Donald B. G-3-161199 | Spanish Camp North | Wharton | 1 | 0 | 112K | Aug 1995 – Mar 2002 |
| Duncan-Hamill G-3-174100 | Spanish Camp (4700) | Wharton | 1 | 0 | 39.5K | Jul 1999 – Dec 2001 |
| Duncan-Hamill G-3-174101 | Spanish Camp (Frio 4500) | Wharton | 1 | 0 | 147K | Jul 1999 – Dec 2001 |
| Haidusek G-2-178925 | Holyfield Fan Man Sand (Yegua 1) | Lavaca | 1 | 437 | 31.2K | Jul 2000 – May 2001 |
| Naiser, William J. et UX G-3-162188 | Johnson Creek (Miocene 2850) | Wharton | 1 | 0 | 258K | Jan 1997 – Feb 2001 |
| Duncan G-3-126377 | Spanish Camp (Frio 4500) | Wharton | 1 | 0 | 52K | Jan 1993 – May 1998 |
| McCan, C.K. Jr. et Al G-2-131824 | Kay Creek (2200) | Victoria | 1 | 1 | 265K | Jan 1993 – Oct 1997 |
| McCan, C.K. Jr. et Al G-2-131230 | Kay Creek (2200) | Victoria | 1 | 0 | 62K | Jan 1993 – Oct 1997 |
| Duncan G-3-117536 | Spanish Camp (Spanish Camp Lo.) | Wharton | 1 | 0 | 126K | Feb 1993 – Feb 1994 |
| Matcek, Benny G-2-125761 | Ganado, E. (Whisler) | Jackson | 1 | 30 | 4.31K | Jan 1993 – Feb 1993 |
| Degarza, H.L. G-4-126544 | Sun, North (Frio 5820) | Starr | 1 | 0 | 0 | — |
| Duncan, F. B. & Donald G-3-34307 | Spanish Camp(spanish Camp 2900U) | Wharton | 1 | 0 | 0 | — |
| Kallus-Volkmer G-2-211701 | ZBF (Frio) | Jackson | 1 | 0 | 0 | — |
| Johnson, J. W. G-4-10618 | Government Wells, N. (2070) | Duval | 1 | 0 | 0 | — |