Ocean dumping : hearings before the Subcommittee on Oceanography and the Subcommittee on Fisheries and Wildlife Conservation, and the Environment of the Committee on Merchant Marine and Fisheries, House of Representatives, Ninety-seventh Congress, second session, on reauthorization of The Marine Protection, Research and Sanctuaries Act, Titles I and II--H.R. 6112 and H.R. 6113, March 18, 23, 26, 1982, proposed ocean dumping user fees--H.R. 6113 and H.R. 6324 (joint committee hearing with Subcommittee on Natural Resources, Agriculture Research, and Environment of the Committee on Science and Technology) June 23, 1982