Treaties and other international acts series. * Paper, $10.00 a yr. (approximately 150 issues), $3.50 additional for foreign mailing; single copies vary in price. 3751. Defense, transfer of property at Roberts Field, agreement between United States and Liberia, effected by exchange of notes signed Washington Apr. 19, 1955, Aug. 21 and Sept. 22, 1956; [entered into force Jan. 4, 1957].