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Senate Hearing, 91st Congress - Pesticides Amendments to Hazardous Substances Act: hearings before the Subcommittee on Energy, Natural Resources, and the Environment of the Committee on Commerce, United States Senate, Ninety-first Congress, second session, on S. 3866, to amend The Hazardous Substances Act to provide for more effective protection against the hazards caused by economic poisons, May 26, and September 29, 1970.