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Senate Hearing, 89th Congress - Third powerplant, Grand Coulee Dam: hearing before the Committee on Interior and Insular Affairs, United States Senate, Eighty-ninth Congress, first session, on S. 1761 a bill to authorize the Secretary of the Interior to construct, operate, and maintain a third powerplant at the Grand Coulee Dam, Columbia Basin Project, Washington, and for other purposes, April 13, 1965.