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Senate Hearing, 92nd Congress - Surface mining. Part 2: 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. 77, S. 630, S. 993, S. 1160, S. 1240, S. 1498, S. 2455, and S. 2777, pending surface mining legislation, November 16, 17, and December 2, 1971 ...