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Senate Hearing, 92nd Congress - Bills amending or related to the National Environmental Policy Act: hearing before the Committee on Interior and Insular Affairs, United States Senate, Ninety-second Congress, first session on H.R. 56, S. 1216, and S. 681, bills amending or related to the National Environmental Policy Act of 1969 (Public Law 91-190), to establish a national environmental data system, a nonprofit national environmental policy institute, and state environmental centers, and for other purposes, November 19, 1971.