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Future of federal coal : status, availability, and impact of technological advances in using coal to

United States. Congress. House. Committee on Resources. Subcommittee on Energy and Mineral Resources.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2006. 2006

Implementation of the provisions of the Energy Policy Act of 2005 : hearings before the Energy and N

United States. Congress. Senate. Committee on Energy and Natural Resources.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2006- 2006