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The vast North American resource potential of oil shale, oil sands, and heavy oils, parts 1 and 2 :

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., 2005. 2005

The vast North American resource potential of oil shale, oil sands, and heavy oils, parts 1 and 2 :

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., 2005. 2005