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Senate Hearing, 94th Congress - Regulation of mining activities within areas of the National Park System: hearing before the Committee on Interior and Insular Affairs, United States Senate, Ninety-fourth Congress, first session, on S. 2371, a bill to provide for the regulation of mining activity within, and to repeal the application of mining laws to, areas of the National Park system, and for other purposes, October 7, 1975.