Shellfish contamination : hearings 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 shellfish diseases and H.R. 3969 ... shellfish contamination and shellfish bed closures, September 26, 1988. (U.S. G.P.O., 1988)