Marine Mammal Protection Act : hearings before the Subcommittee on Fisheries and Wildlife Conservation and the Environment of the Committee on Merchant Marine and Fisheries, House of Representatives, Ninety seventh Congress, first session, on Marine Mammal Protection Act Authorization H.R. 2948, April 7, 1981, Marine Mammal Protection Act Improvement H.R. 4084, July 13, 1981.

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