Treaties and other international acts series. 5796. Technical cooperation, agriculture and natural resource, agreement between United States and Brazil, amending and extending agreement of June 26, 1953, as amended and exteded, effected by exchange of notes, signed Rio de Janeiro, Dec. 31, 1964 and Apr. 5, 1965; [entered into force Apr. 5, 1965, effective Jan. 1, 1965].