and the Office international d'hygiène publique to the United Nations and World Health Organization. Eventually, both the 1912 and the 1925 Conventions were superseded by the 1961 Single Convention on Narcotic Drugs which merged the Permanent Central Opium Board and the Drug Supervisory Body onto the INCB. See also International Drug Control International law Single Convention on Narcotic Drugs League of Nations Office international d'hygiène publique Timeline of cannabis law Legal issues of cannabis References The beginnings of international drug control , UN Chronicle, Summer, 1998. International Opium Convention Signed at The Hague January 23, 1912. External links Text of the 1912 convention Text of the 1925 convention Signatures and ratifications. Opium Museum A primer on the UN Drug Control Conventions Transnational Institute. Losing Ground: Drug Control and War in Afghanistan Transnational Institute. Drug control treaties 1912 in the Netherlands Treaties concluded in 1909 Treaties entered into force in 1915 Treaties entered into force in 1919 Opium Treaties of the Weimar Republic Treaties of the United States Treaties of the Republic of China (1912–1949) Treaties of the French Third Republic Treaties of the United Kingdom (1801–1922) Treaties of the Kingdom of Italy (1861–1946) Treaties of the Empire of Japan Treaties of the Portuguese First Republic Treaties of Thailand Treaties of the Kingdom of Afghanistan Treaties of the Albanian Republic Treaties of Argentina Treaties of the First Austrian Republic Treaties of Belgium Treaties of Bolivia Treaties of the First Brazilian Republic Treaties of the Kingdom of Bulgaria Treaties of Chile Treaties of Colombia Treaties of Costa Rica Treaties of Cuba Treaties of Czechoslovakia Treaties of Denmark Treaties of the Dominican Republic Treaties of Ecuador Treaties of the Kingdom of Egypt Treaties of Estonia Treaties of Finland Treaties of France Treaties of the Kingdom of Greece Treaties of Guatemala Treaties of Haiti Treaties of Honduras Treaties of the Kingdom of Hungary (1920–1946) Treaties of Latvia Treaties of Liberia Treaties of Luxembourg Treaties of Mexico Treaties of Monaco Treaties of Nicaragua Treaties of Norway Treaties of Panama Treaties of Paraguay Treaties of Peru Treaties of the Second Polish Republic Treaties of the Kingdom of Romania Treaties of El Salvador Treaties of Saudi Arabia Treaties of Spain under the Restoration Treaties of Sweden Treaties of Switzerland Treaties of Turkey Treaties of Uruguay Treaties of Venezuela Treaties of Yugoslavia Treaties extended to the Falkland Islands Treaties extended to Gibraltar Treaties extended to Saint Helena, Ascension