Ocean disposal of contaminated dredge material : hearing before the Subcommittee on Oceanography, Gulf of Mexico, and the Outer Continental Shelf of the Committee on Merchant Marine and Fisheries, House of Representatives, One Hundred Third Congress, first session, on the effects of ocean disposal of contaminated materials on our marine environment and potential alternatives to ocean disposal of contaminated material, March 30, 1993. (U.S. G.P.O., 1993)