Estimated world requirements of narcotic drugs, and estimates of world production of opium in 1975: statement issued by the International Narcotics Control Board under article 5 of the 1931 Convention for limiting the manufacture and regulating the distribution of narcotic drugs, as amended by the 1946 Protocol, and under article 12 of the Single Convention on Narcotics and Drugs, 1961.- - New York : United Nations, 1974. - 55 p.