Supplementary agreement between the United States of America and Canada amending with regard to fox furs and skins the agreement of November 17, 1938 respecting reciprocal trade. Signed at Washington and New York December 13, 1940; proclaimed by the President of the United States December 18, 1940; ratified by His Majesty in respect of Canada June 14, 1941; proclamation and ratification exchanged at Washington August 13, 1941; supplementary proclamation by the President of the United States August 21, 1941; effective provisionally December 20, 1940; effective definitively August 14, 1941.