Naval charter for lease of vessels to the Philippines under Public law 454, 79th Congress agreement between the United States of America and the Republic of the Philippines modifying Agreement of March 21, 1947, effected by exchanges of notes signed at Manila September 26 and December 9, 1947, and May 6 and June 7, 1948, entered into force June 7, 1948. (Publication U.S. Dept. of State, 1950)