Marine Mammal Protection Act authorizations. Part 1 : hearing before the Subcommittee on Fisheries and Wildlife Conservation and the Environment of the Committee on Merchant Marine and Fisheries, House of Representatives, One Hundredth Congress, second session on H.R. 4189, to authorize appropriations to carry out the Marine Mammal Protection Act of 1972 for fiscal years 1989 through 1993 : May 10, 1988