Mexico. Plantation rubber investigations, agreement between United States and Mexico, continuing in force agreement of Apr. 11, 1941, as supplemented by agreement of July 14, 1942 and agreement of Mar. 3, 4. and 29 and Apr. 3, 1943, effected by exchange of notes, signed Mexico City, July 10 and Sept. 20, 1943, effective July 1, 1943; and texts of agreements of Apr. 11, 1941, July 14, 1942 and Mar. 3, 4. and 29 and Apr. 3, 1943.