Duck-stamp legislation : hearings before the Subcommittee on Fisheries and Wildlife Conservation of the Committee on Merchant Marine and Fisheries, House of Representatives, eighty-fifth Congress, second session, on H.R. 12006, to amend the Migratory Bird Hunting Stamp Act of March 16, 1934, as amended, and related bills H.R. 11607, H.R. 11642, H.R. 12072, and S. 2617 : May 8 and June 25, 1958. (U.S. G.P.O.,, 1958)