Convention between the United States of America and other American Republics respecting nature protection and wildlife preservation in the Western Hemisphere. Opened for signature at the Pan American Union at Washington October 12, 1940; signed for the United States of America October 12, 1940; ratification advised by the Senate of the United States of America April 7, 1941; ratified by the President of the United States April 15, 1941; ratification of the United States deposited with the Pan American Union at Washington April 28, 1941; proclaimed by the President of the United States April 30, 1942.