Treaties and other international acts series. 3 Paper, $10.00 a yr. (approximately 150 issues), $6.00 additional for foreign mailing; single copies vary in price. 4320. Economic cooperation, agreement between United States and Burma, amending agreement of Mar. 21, 1957, effected by exchange of notes signed Rangoon Sept. 12, 1959; [entered into force Sept. 12, 1959].