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Senate Hearing, 92nd Congress - Problems of electrical power production in the Southwest. Part 6: hearings before 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 environmental problems associated with the production of electrical power by coal-fired plants in the Four Corners Region of the Southwest U.S. Washington, D.C.-November 10, 1971.