Agreement between the United States and Great Britain extending the duration of the arbitration convention of April 4, 1908 1
 Agreement signed at Washington, June 3, 1918; ratification advised by the Senate, June 24, 1918; ratified by the President, September 20, 1918; ratified by Great Britain, July 15, 1918; ratifications exchanged at Washington, September 24, 1918; proclaimed, September 30, 1918
Done in the District of Columbia this thirtieth day of September in the year of our Lord one thousand nine hundred and eighteen, and of the Independence of the United States of America the one hundred and forty-third.
Treaty Series, No. 635