Estimated world requirements of narcotic drugs and estimates of world production of opium in 1968 : Statement issued by the Supervisory Body under article 5 of the Convention of 13 July 1931 for limiting the manufacture and regulating the distribution of Narcotic drugs, as amended by the Protocol of 11 December 1946, and under article 12 of the Single Convention on Narcotic Drugs, 1961.

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