Treaties and other international acts series. 4310. Mexican agricultural workers, agreements between United States and Mexico extending agreement of Aug. 11, 1951, as amended and extended, effected by exchange of notes signed Mexico Aug. 31, 1959, and exchange of notes signed Mexico July 28 and 30, 1959, and exchange of notes signed Mexico June 24 and 27, 1959; [entered into force Aug. 31, July 30, and June 27, 1959].