Treaties and other international acts series. 2670. Relief supplies and packages for British/United States zone, Free Territory of Trieste, duty-free entry and free inland transportation, agreement between United States and British/United States zone, Free Territory of Trieste, amending agreement of Feb. 11, 1949, effected by exchange of letters, signed Trieste June 30 and July 18, 1952; entered into force July 18, 1952.