Treaties and other international acts series. 5720. Trade, quality wheat, agreement between United States and European Economic Community and member States, extending date for beginning negotiations under par. BID of agreement of Mar. 7, 1962, effected by exchanges of letters signed Brussels June 11 and July 20, 1964, and June 28 and Aug. 21, 1963; [entered into force July 20, 1964, and Aug. 21, 1963].