Operation Coastal Shield : hearings before the Subcommittee on Fisheries and Wildlife Conservation and the Environment and the Subcommittee on Oceanography, Great Lakes, and the Outer Continental Shelf of the Committee on Merchant Marine and Fisheries, House of Representatives, One Hundred Second Congress, first session, on H.R. 2029 ... April 25, 1991 ; June 6, 1991 ; and July 25, 1991--Washington, D.C. ; May 20, 1991--Marion, Massachusetts. (U.S. G.P.O., 1991)