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Senate Hearing, 91st Congress - National environmental policy: hearing before the Committee on Interior and Insular Affairs, United States Senate, Ninety-first Congress, first session, S. 1075, S. 237, and S. 1752, bills to authorize the Secretary of the Interior to conduct investigations, studies, surveys, and research relating to the Nation's ecological systems, natural resources, and environmental quality, and to establish a Council on Environmental Quality, April 16, 1969.