Treaties and other international nets series. 1671. Narcotic drugs, protocol, with annex, between United States and other Governments, amending agreements, conventions, and protocols of Jan. 23, 1912, Feb. 11, 1923, Feb. 19, 1925, July 13, 1931, Nov. 27, 1931. and June 26, 1936; proclaimed Oct. 14, 1947, entered into force Aug. 12, 1947.