Agreement between the United States and Italy extending the duration of the Arbitration Convention of March 28, 19081
Washington , December 18, 1918.
Washington , January 15, 1919.
 Agreement between the United States of America and Italy, Signed at Washington, March 20, 1919
Done in duplicate, in the English and Italian languages, at Washington this 20th day of March nineteen hundred and nineteen.
Treaty Series No. 645