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Senate Hearing, 89th Congress - Ecological research and surveys: hearing before the Committee on Interior and Insular Affairs, United States Senate, Eighty-ninth Congress, second session on S. 2282, a bill to authorize the Secretary of the Interior to conduct a program of research, study and surveys, documentation, and description of the natural environmental systems of the United States for the purpose of understanding and evaluating the condition of these systems and to provide information to those concerned with natural resources management, and for other purposes. April 27, 1966.