| Company | INTEGRATED GEOTECHNICS, LTD. |
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| Company | APC 2001-A LIMITED PARTNERSHIP |
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| Company | APC 2001-B LIMITED PARTNERSHIP |
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| Company | APC 2002-A |
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| Company | APC 2000-B LIMITED PARTNERSHIP |
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| Company | APC 2000-A LIMITED PARTNERSHIP |
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| Company | APC 2006-B PRIVATE DRILLING PROGRAM LIMITED PARTNERSHIP |
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| Company | ALLIANCE PETROLEUM CORPORATION 1998-1 PRIVATE DRILLING PROGRAM |
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| Company | APC 2002-B PRIVATE DRILLING PROGRAM LLP |
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| Company | ALLIANCE PETROLEUM CORPORATION 1999-C PRIVATE DRILLING PROGRAM, LIMITED PARTNERSHIP |
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| Company | ALLIANCE PETROLEUM CORPORATION 1999-B PRIVATE DRILLING PROGRAM, LIMITED PARTNERSHIP |
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| Company | ALLIANCE PETROLEUM CORPORATION 1999-A PRIVATE DRILLING PROGRAM, LIMITED PARTNERSHIP |
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| Company | APC 2003-A PRIVATE DRILLING PROGRAM LP |
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| Company | APC 2003-B PRIVATE DRILLING PROGRAM |
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| Company | APC 2003-B PRIVATE DRILLING PROGRAM LIMITED PARTNERSHIP |
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| Company | APC 2004-B PRIVATE DRILLING PROGRAM LIMITED PARTNERSHIP |
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| Company | APC 2004-A PRIVATE DRILLING PROGRAM LIMITED PARTNERSHIP |
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| Company | APC 2005-B PRIVATE DRILLING PROGRAM LIMITED PARTNERSHIP |
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| Company | APC 2006-A PRIVATE DRILLING PROGRAM LIMITED PARTNERSHIP |
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