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Senate Hearing, 93rd Congress - Federal Coal Leasing Program. Part 3: hearings before the Subcommittee on Minerals, Materials and Fuels of the Committee on Interior and Insular Affairs, United States Senate, Ninety-third Congress, second session on the Department of the Interior's Future Leasing Program for the Federal Coal Resources of the Northern Great Plains. Billings, Mont., April 20, 1974.