National wildlife refuges : hearings before the Subcommittee on Fisheries and Wildlife Conservation and the Environment of the Committee on Merchant Marine and Fisheries, House of Representatives, Ninety-sixth Congress on Suisun Marsh -- H.R. 4084, September 27, 1979; San Francisco Bay National Wildlife Refuge -- H.R. 4887, Great Dismal Swamp National Wildlife Refuge -- H.R. 4889, Tinicum National Environmental Center -- H.R. 5679, October 25, 1979; National Wildlife Refuge System Oversight, October 29, 30, 1979; Harris Neck National Wildlife Refuge -- H.R. 4018, December 7, 1979; Tensas National Wildlife Refuge -- H.R. 3107, H.R. 6022, December 7, 1979; Bogue Chitto National Wildlife Refuge -- H.R. 6169, Bon Secour National Wildlife Refuge -- H.R. 6727, Federal-State Cooperative Agreement -- H.R. 6839, March 21, 1980.