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Senate Hearing, 92nd Congress - Surface mining. Part 3: hearings before the Subcommittee on Minerals, Materials, and Fuels of the Committee on Interior and Insular Affairs, United States Senate, pursuant to S. Res. 45, a national fuels and energy policy study, Ninety-second Congress, first session, on S. 2777 and S. 3000, bills to provide for cooperation between the Secretary of the Interior and the States with respect to the regulation of surface mining operations, and for other purposes, February 24, 1972 ...