Supplementary protocol between the United States of America and other governments respecting whaling, bringing into force in entirety the protocol of November 26, 1945. Signed at London March 3, 1947; ratification advised by the Senate of the United States of America July 2, 1947; ratified by the President of the United States of America July 18, 1947; ratification of the United States of America deposited at London August 1, 1947; proclaimed by the President of the United States of America August 18, 1947; entered into force with respect to the United States of America August 1, 1947.