Treaties and other international acts series. 2213. Health and sanitation, cooperative program in Chile, agreements between United States and Chile, providing for extension of program, effected by exchange of notes signed Santiago, July 1 and 31, 1949, entered into force Aug. 5, 1949, operative retroactively July 1, 1949, and exchanges of notes signed Santiago, Dec. 28, 1948 and Jan. 10, 1949, and Jan. 20 and 21, 1949; entered Into force Jan. 22, 1949, operative retroactively Jan. 1, 1949.

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