Dingell-Johnson fund--N. Pacific fur seal [microform] : 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, second session, on Dingell-Johnson expansion fund--H.R. 6074, March 18, 1980, management of the North Pacific fur seal--H.R. 5033, April 28, 1980