• EnerVest Monroe Gathering, Ltd.
• EnerVest-Cargas, Ltd.
• Luca Technologies Inc
• Venoco Acquisition Company, L.P.
• Hawker Energy, Inc.
• HK Energy Partners LP
• Whiting USA Trust I
• Eos Petro, Inc.
• Spirit Exploration, Inc.
• Trans-Pacific Aerospace Company, Inc.
• Atlas Energy Michigan, LLC
• Atlas Gas & Oil Company, LLC
• Atlas Energy Ohio, LLC
• Atlas Noble, LLC
• Atlas America, LLC
• Aic, LLC
• Westside Pipeline Company, LLC
• AER Pipeline Construction, Inc.
• Viking Resources, LLC
• Resource Energy, LLC
• Resource Well Services, LLC
• Rei-Ny, LLC
• Hydrocarb Energy Corp
• Richland Resources Corp.
• Colony Energy, Inc.
• Cougar Oil & Gas Canada Inc.
• Atlas Energy Finance Corp.
• Atlas Energy Operating Company, LLC
• Encompass Energy Services, Inc.
• Gastar Exploration Texas LP
• Gastar Exploration Texas LLC
• Gastar Exploration Texas, Inc.
• Gastar Exploration Victoria, Inc.
• Gastar Exploration New South Wales, Inc.
• Gastar Exploration Inc.
• Legacy Reserves Operating GP LLC
• Legacy Reserves Operating LP
• Legacy Reserves Services LLC
• American Sands Energy Corp.
• Mining Oil, Inc.
• Atlas Resources Public #18-2009 (B) L.P.
• Atlas Resources Public #18-2008 (A) L.P.
• Antero Resources Corporation
• Atlas Resources Public #18-2009 (C) L.P.
• Atlas Resources Public #18-2008 Program
• Spirits Time International Inc
• Hondo Pipeline, Inc.
• Mason Pipeline LTD Liability CO
• MarkWest Marketing, L.L.C.
• MarkWest Gas Services, L.L.C.

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