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House Hearing, 93rd Congress - Department of the Interior and related agencies appropriations for 1974. Part 3, Bureau of Mines; Federal Metal and Nonmetallic Mine Safety Board of Review; Geological Survey; Office of Coal Research; Office of Oil and Gas; Office of the Secretary; Office of the Solicitor; Office of Water Resources Research: hearings before a subcommittee of the Committee on Appropriations, House of Representatives, Ninety-third Congress, first session.