Increased penalties for violations of Migratory Bird Treaty Act : hearing before the Subcommittee on Fisheries and Wildlife Conservation of the Committee on Merchant Marine and Fisheries, House of Representatives, Eighty-sixth Congress, second session on H.R. 11430 and H.R. 11674, to amend the Migratory Bird Treaty Act to increase the penalties for violation of such act, and for other purposes, May 3, 1960. (U.S. G.P.O., 1961)