U.N. sanctions against Rhodesia--chrome : hearings, Ninety-second Congress, first session, on S. 1404, to amend the United Nations Participation Act of 1945 to prevent the imposition thereunder of any prohibition on the importation into the United States of any strategic and critical material from any free world country for so long as the importation of like material from any communist country is not prohibited by law, July 7 and 8, 1971. (U.S. Govt. Print. Off, 1971)