Ocean dumping : hearing before he 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, One Hundredth Congress, second session on an oversight to prohibit the dumping of any sewage sludge after December 1991, February 23, 1988. (U.S. G.P.O. :, 1988)