Supplementary agreement between the United States and Costa Rica regarding cooperative rubber investigations in Costa Rica, and agreement continuing in force the original agreement as amended

[For text of original agreement for cooperative rubber investigations in Costa Rica effected by exchange of notes signed at San José April 19 and June 16, 1941, see Department of State Executive Agreement Series No. 222, or 55 Stat. (pt. 2) 1368. For text of supplementary agreement effected by exchange of notes signed at San José April 3, 1943, see Executive Agreement Series No. 318, or 57 Stat. (pt. 2) 944. For agreement continuing in force the original agreement as amended by the supplementary agreement, effected by exchange of notes signed at San José June 21 and July 1, 1943, see Executive Agreement Series No. 335, or 57 Stat. (pt. 2) 1048.]