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Senate Hearing, 88th Congress - Manson Unit, Chelan Division, Washington: hearing before the Subcommittee on Irrigation and Reclamation of the Committee on Interior and Insular Affairs, United States Senate, Eighty-eighth Congress, second session, on S. 2533, a bill to authorize the Secretary of the Interior to construct, operate, and maintain the manson unit, Chelan division, Chief Joseph Dam Project, Washington, and for other purposes. March 17, 1964.