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               ENTITY NAME                             STATE OF INCORPORATION
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Atlas America, Inc.                                         Pennsylvania
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AIC, Inc.                                                   Delaware
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Anthem Securities, Inc.                                     Pennsylvania
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Atlas Energy Corporation                                    Ohio
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Atlas Energy Group, Inc.                                    Ohio
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AED Investments, Inc.                                       Delaware
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Atlas Resources, Inc.                                       Pennsylvania
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ARD Investments, Inc.                                       Delaware
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Pennsylvania Industrial Energy, Inc.                        Pennsylvania
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Atlas Information Management, LLC                           Pennsylvania
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Resource Energy, Inc.                                       Delaware
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REI-NY, Inc.                                                Delaware
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Resource Well Services, Inc.                                Delaware
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Viking Resources Corporation                                Pennsylvania
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RFI Holding Company, Inc.                                   Ohio
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Viking Investments, Inc.                                    Delaware
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Atlas Noble Corp.                                           Delaware
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Atlas America Mid-Continent, Inc.                           Delaware
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Atlas Pipeline Partners GP, LLC                             Delaware
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Atlas Pipeline Partners, L.P.                               Delaware
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APC Acquisition, LLC                                        Delaware
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Atlas Pipeline Operating Partnership, L.P.                  Delaware
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Atlas Pipeline New York, LLC                                Pennsylvania
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Atlas Pipeline Ohio, LLC                                    Pennsylvania
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Atlas Pipeline Pennsylvania, LLC                            Pennsylvania
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Spectrum Field Services, LLC                                Delaware
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