| 502091 | Nov 17, 2000 | Nov 17, 2000 | Chesapeake Operating, Inc. | Carl #1HH | 16,500 | 47730835 |
| 502035 | Nov 16, 2000 | Nov 16, 2000 | Chesapeake Operating, Inc. | Schulte #2HH | 16,500 | 47730837 |
| 500181 | Nov 16, 2000 | Nov 16, 2000 | 7711 Corporation, The | Patroit "A" #2HH | 10,777 | 47730542 |
| 500181Amendment | Nov 16, 2000 | Nov 16, 2000 | 7711 Corporation, The | Patroit "A" #2HH | 10,777 | 47730542 |
| 499919 | Sep 21, 2000 | Sep 21, 2000 | Swift Energy Company | Divin Unit #1 | 14,800 | 47730883 |
| 499627 | Sep 14, 2000 | Sep 14, 2000 | Chesapeake Operating, Inc. | Ricks #1HH | 16,500 | 47730759 |
| 499173 | Sep 8, 2000 | Sep 8, 2000 | 7711 Corporation, The | Patroit #1HH | 10,777 | 47730499 |
| 499173Amendment | Sep 8, 2000 | Sep 8, 2000 | 7711 Corporation, The | Patroit #1HH | 10,777 | 47730499 |
| 498972 | Aug 29, 2000 | Aug 29, 2000 | Union Pacific Resources Company | Yelderman-Bredthauer Unit #1H | 14,000 | 47730688 |
| 496315 | Jun 19, 2000 | Jun 19, 2000 | Chesapeake Operating, Inc. | Muellersville #1HH | 16,500 | 47730882 |
| 496315Amendment | Jun 19, 2000 | Jun 19, 2000 | Chesapeake Operating, Inc. | Muellersville #1HH | 16,500 | 47730882 |
| 495140 | May 17, 2000 | May 17, 2000 | Grand Operating, Inc. | Falls #2HH | 14,200 | 47730881 |
| 495094 | May 16, 2000 | May 16, 2000 | Union Pacific Resources Company | Becker Unit #1REH | 14,000 | 47730743 |
| 495094Amendment | May 16, 2000 | May 16, 2000 | Rme Petroleum Company | Becker Unit #1REH | 14,400 | 47730743 |
| 494431 | Apr 25, 2000 | Apr 25, 2000 | Chesapeake Operating, Inc. | Isaac #1HH | 16,500 | 47730880 |
| 492993 | Mar 13, 2000 | Mar 13, 2000 | Chesapeake Operating, Inc. | Grebe #1HH | 16,500 | 47730838 |
| 492941 | Mar 10, 2000 | Mar 10, 2000 | Union Pacific Resources Company | Ehrlund Unit #1H | 20,000 | 47730879 |
| 492341 | Feb 22, 2000 | Feb 22, 2000 | 7711 Corporation, The | Means #1HH | 17,777 | 47730338 |
| 492341Amendment | Feb 22, 2000 | Feb 22, 2000 | 7711 Corporation, The | Means #1HH | 17,777 | 47730338 |
| 491693 | Feb 8, 2000 | Feb 8, 2000 | Grand Operating, Inc. | Falls #1HH | 14,200 | 47730822 |
| 491497 | Jan 27, 2000 | Jan 27, 2000 | Chesapeake Operating, Inc. | Salem #2HH | 16,500 | 47730878 |
| 491497Amendment | Jan 27, 2000 | Jan 27, 2000 | Chesapeake Operating, Inc. | Salem #2HH | 16,500 | 47730878 |
| 490761 | Dec 30, 1999 | Dec 30, 1999 | Chesapeake Operating, Inc. | Phillipsburg #1HH | 16,500 | 47730877 |
| 490761Amendment | Dec 30, 1999 | Dec 30, 1999 | Chesapeake Operating, Inc. | Phillipsburg #1HH | 16,500 | 47730877 |
| 488054 | Sep 29, 1999 | Sep 29, 1999 | Chesapeake Operating, Inc. | Hiram #1HH | 16,500 | 47730876 |
| 486079 | Jul 22, 1999 | Jul 22, 1999 | Chesapeake Operating, Inc. | Carmona #1HH | 16,500 | 47730875 |
| 486079Amendment | Jul 22, 1999 | Jul 22, 1999 | Chesapeake Operating, Inc. | Carmona #1HH | 16,500 | 47730875 |
| 482853 | Feb 22, 1999 | Feb 22, 1999 | Chesapeake Operating, Inc. | Weiss #1HH | 16,500 | 47730874 |
| 482853Amendment | Feb 22, 1999 | Feb 22, 1999 | Chesapeake Operating, Inc. | Weiss #1HH | 16,500 | 47730874 |
| 482098 | Jan 22, 1999 | Jan 22, 1999 | 7711 Corporation, The | Defresne Unit #1HH | 13,777 | 47730816 |
| 481448 | Dec 11, 1998 | Dec 11, 1998 | Chesapeake Operating, Inc. | Tiemann #1HH | 16,500 | 47730873 |
| 473244 | Dec 11, 1998 | Dec 11, 1998 | Union Pacific Resources Company | Van Eman Unit #1H | 14,700 | 47730858 |
| 481278 | Dec 4, 1998 | Dec 4, 1998 | Union Pacific Resources Company | Milam Unit #1H | 15,000 | 47730724 |
| 480413 | Oct 28, 1998 | Oct 28, 1998 | Union Pacific Resources Company | Wehmeyer Unit #1H | 15,500 | 47730872 |
| 479865 | Oct 2, 1998 | Oct 2, 1998 | Chesapeake Operating, Inc. | Salem OL #1HH | 16,500 | 47730871 |
| 479865Amendment | Oct 2, 1998 | Oct 2, 1998 | Chesapeake Operating, Inc. | Salem OL #1HH | 16,500 | 47730871 |
| 479276 | Sep 4, 1998 | Sep 4, 1998 | Union Pacific Resources Company | Seidel Unit #1H | 15,500 | 47730859 |
| 478424 | Jul 31, 1998 | Jul 31, 1998 | Chesapeake Operating, Inc. | Hahn #2HH | 16,500 | 47730870 |
| 478234 | Jul 24, 1998 | Jul 24, 1998 | Union Pacific Resources Company | Jaster Unit #1H | 15,500 | 47730869 |
| 477975 | Jul 15, 1998 | Jul 15, 1998 | Chesapeake Operating, Inc. | Mill Creek OL #1HH | 16,500 | 47730868 |
| 477975Amendment | Jul 15, 1998 | Jul 15, 1998 | Chesapeake Operating, Inc. | Mill Creek OL #1HH | 16,500 | 47730868 |
| 476412 | May 28, 1998 | May 28, 1998 | Hall, D. Corporation | Smith, Rufus #5 | 950 | 47730867 |
| 476411 | May 28, 1998 | May 28, 1998 | Hall, D. Corporation | Smith, Rufus #1 | 950 | 47730866 |
| 476411Amendment | May 28, 1998 | May 28, 1998 | Hall, D. Corporation | Smith, Rufus #1 | 950 | 47730866 |
| 476410 | May 28, 1998 | May 28, 1998 | Hall, D. Corporation | Smith, Rufus #2 | 950 | 47730865 |
| 476409 | May 28, 1998 | May 28, 1998 | Hall, D. Corporation | Smith, Rufus #4 | 950 | 47730864 |
| 475992 | May 5, 1998 | May 5, 1998 | Union Pacific Resources Company | Murski Unit #1H | 15,750 | 47730863 |
| 475745 | Apr 30, 1998 | Apr 30, 1998 | Union Pacific Resources Company | Tooker Unit #1H | 16,500 | 47730862 |
| 474732 | Mar 27, 1998 | Mar 27, 1998 | Union Pacific Resources Company | Hahn Unit #1H | 16,500 | 47730861 |
| 474732Amendment | Mar 27, 1998 | Mar 27, 1998 | Union Pacific Resources Company | Hahn Unit #1H | 12,800 | 47730861 |
| 474732Amendment | Mar 27, 1998 | Mar 27, 1998 | Union Pacific Resources Company | Hahn Unit #1H | 12,800 | 47730861 |
| 474613 | Mar 20, 1998 | Mar 20, 1998 | Chesapeake Operating, Inc. | Hahn OL #1HH | 15,400 | 47730860 |
| 474613Amendment | Mar 20, 1998 | Mar 20, 1998 | Chesapeake Operating, Inc. | Hahn OL #1HH | 15,400 | 47730860 |
| 473886 | Mar 2, 1998 | Mar 2, 1998 | Union Pacific Resources Company | Seidel Unit #1H | 15,500 | 47730859 |
| 473886Amendment | Mar 2, 1998 | Mar 2, 1998 | Union Pacific Resources Company | Seidel Unit #1H | 15,500 | 47730859 |
| 473886Amendment | Mar 2, 1998 | Mar 2, 1998 | Union Pacific Resources Company | Seidel Unit #1H | 15,500 | 47730859 |
| 472801 | Jan 30, 1998 | Jan 30, 1998 | Marathon Oil Company | Powell "B" #1H | 17,500 | 47730857 |
| 472500 | Jan 21, 1998 | Jan 21, 1998 | Union Pacific Resources Company | Corn Unit #1H | 15,500 | 47730856 |
| 470150 | Nov 17, 1997 | Nov 17, 1997 | Marathon Oil Company | Hodde #1H | 17,500 | 47730855 |
| 469566 | Nov 6, 1997 | Nov 6, 1997 | Union Pacific Resources Company | Watford Unit #1H | 11,250 | 47730705 |
| 469403 | Oct 29, 1997 | Oct 29, 1997 | Union Pacific Resources Company | Cobb Unit #1H | 15,500 | 47730854 |
| 467623 | Sep 16, 1997 | Sep 16, 1997 | Union Pacific Resources Company | Eberle Unit #2H | 15,600 | 47730853 |
| 467094 | Sep 15, 1997 | Sep 15, 1997 | Union Pacific Resources Company | Thornhill Unit #1H | 15,000 | 47730852 |
| 465805 | Aug 4, 1997 | Aug 4, 1997 | Cantro Exploration, Inc. | Seward #1HH | 13,500 | 47730775 |
| 465681 | Jul 31, 1997 | Jul 31, 1997 | Union Pacific Resources Company | Hensen Unit #1H | 14,850 | 47730832 |
| 465333 | Jul 31, 1997 | Jul 31, 1997 | Union Pacific Resources Company | 3-D Unit #1H | 15,600 | 47730851 |
| 464917 | Jul 21, 1997 | Jul 21, 1997 | Young, John H., Inc. | Abigail #1 | 16,000 | 47730850 |
| 464802 | Jul 11, 1997 | Jul 11, 1997 | Chesapeake Operating, Inc. | Hermann #2HH | 14,600 | 47730849 |
| 464376 | Jun 27, 1997 | Jun 27, 1997 | Garrison Ltd. | Tomcat #2H | 16,000 | 47730502 |
| 463793 | Jun 16, 1997 | Jun 16, 1997 | Union Pacific Resources Company | Jarmon Unit #1H | 15,500 | 47730848 |
| 463793Amendment | Jun 16, 1997 | Jun 16, 1997 | Union Pacific Resources Company | Jarmon Unit #1H | 15,500 | 47730848 |
| 463618 | Jun 11, 1997 | Jun 11, 1997 | Chesapeake Operating, Inc. | Vaughn #1HH | 14,600 | 47730847 |
| 463089 | Jun 5, 1997 | Jun 5, 1997 | Union Pacific Austin Chalk Co. | Wilkening Unit #1H | 11,300 | 47730458 |
| 462554 | May 16, 1997 | May 16, 1997 | Shield Petroleum | Gillis Unit #1H | 14,400 | 47730795 |
| 462554Amendment | May 16, 1997 | May 16, 1997 | Shield Petroleum | Gillis Unit #1H | 14,400 | 47730795 |
| 462554Amendment | May 16, 1997 | May 16, 1997 | Shield Petroleum | Gillis Unit #1H | 14,150 | 47730795 |
| 462004 | May 5, 1997 | May 5, 1997 | Shield Petroleum | O'Malley #1HH | 15,500 | 47730826 |
| 461999 | May 5, 1997 | May 5, 1997 | Shield Petroleum | Bay-Houston Towing Co. #1HH | 16,500 | 47730846 |
| 460577 | Apr 1, 1997 | Apr 1, 1997 | Chesapeake Operating, Inc. | Wackman #1HH | 20,230 | 47730845 |
| 460577Amendment | Apr 1, 1997 | Apr 1, 1997 | Chesapeake Operating, Inc. | Wackman OL #1HH | 14,600 | 47730845 |
| 460301 | Mar 24, 1997 | Mar 24, 1997 | Shield Petroleum | O'Malley #1HH | 17,000 | 47730826 |
| 460039 | Mar 18, 1997 | Mar 18, 1997 | Union Pacific Resources Company | Lauter Unit #1H | 15,100 | 47730844 |
| 459326 | Mar 3, 1997 | Mar 3, 1997 | Union Pacific Resources Company | Dallmeyer Unit #1H | 11,600 | 47730479 |
| 458720 | Feb 21, 1997 | Feb 21, 1997 | Union Pacific Resources Company | Neumann Unit #2H | 15,000 | 47730843 |
| 458720Amendment | Feb 21, 1997 | Feb 21, 1997 | Union Pacific Resources Company | Neumann Unit #2H | 15,000 | 47730843 |
| 458064 | Jan 31, 1997 | Jan 31, 1997 | Chesapeake Operating, Inc. | Bar L. Ranch #1HH | 15,100 | 47730842 |
| 457902 | Jan 28, 1997 | Jan 28, 1997 | Chesapeake Operating, Inc. | Bosse #1HH | 15,700 | 47730841 |
| 457324 | Jan 17, 1997 | Jan 17, 1997 | Union Pacific Resources Company | Seeker Unit #1H | 14,200 | 47730780 |
| 457210 | Jan 15, 1997 | Jan 15, 1997 | Union Pacific Resources Company | Cassidy Unit #1H | 13,790 | 47730781 |
| 457156 | Jan 14, 1997 | Jan 14, 1997 | Union Pacific Resources Company | City of Brenham Unit #1H | 15,000 | 47730807 |
| 457060 | Jan 7, 1997 | Jan 7, 1997 | Chesapeake Operating, Inc. | Brown #1HH | 15,000 | 47730840 |
| 456586 | Dec 20, 1996 | Dec 20, 1996 | Shield Petroleum | Falls Unit #1HH | 17,000 | 47730822 |
| 456586Amendment | Dec 20, 1996 | Dec 20, 1996 | Shield Petroleum | Falls Unit #1HH | 17,000 | 47730822 |
| 456194 | Dec 16, 1996 | Dec 16, 1996 | Union Pacific Resources Company | Becker Unit #1H | 14,500 | 47730743 |
| 456194Amendment | Dec 16, 1996 | Dec 16, 1996 | Union Pacific Resources Company | Becker Unit #1H | 14,500 | 47730743 |
| 462969 | Nov 7, 1996 | Nov 7, 1996 | Chesapeake Operating, Inc. | Rau OL #1HH | 15,000 | 47730815 |
| 454883 | Nov 7, 1996 | Nov 7, 1996 | Chesapeake Operating, Inc. | Grebe #1HH | 15,000 | 47730838 |
| 454882 | Nov 7, 1996 | Nov 7, 1996 | Chesapeake Operating, Inc. | Mangum #1HH | 15,000 | 47730839 |
| 454882Amendment | Nov 7, 1996 | Nov 7, 1996 | Chesapeake Operating, Inc. | Mangum OL #1HH | 15,000 | 47730839 |
| 454547 | Nov 7, 1996 | Nov 7, 1996 | Union Pacific Resources Company | Husemann Unit #1H | 13,800 | 47730790 |