Wetlands acquisition and oil pollution of the sea. : Hearing before the Merchant Marine and Fisheries Subcommittee of the Committee on Commerce, United States Senate, Eighty-seventh Congress, first session, on S. 2187, a bill to implement the provisions of the International convention for the prevention of the pollution of the sea by oil, 1954; and S. 2175 and H. R. 7391, bills to promote the conservation of migratory waterfowl by the acquisition of wetlands and other essential waterfowl habitat, and for other purposes. July 31, 1961. (U.S. Govt. Print. Off, 1961)