Treaties and other international acts series. 4377. Weather stations, cooperative program on Curacao and St. Martin islands, agreements between United States and Netherlands, extending agreement of Aug. 6 and 16, 1956, as extended, effected by exchange of notes dated The Hague July 21 and Oct. 10, 1958; [entered into force Oct. 10, 1958, operative retroactively Sept. 12, 1958].