From among the States Members of the United Nations and members of the specialized agencies and the Parties to the Single Convention on Narcotic Drugs, 1961; With due regard to the adequate representation of countries that are important producers of opium or coca leaves, of countries that are important in the field of the manufacture of narcotic drugs, and of countries in which drug addiction or the illicit traffic in narcotic drugs constitutes an important problem; Taking into account the principle of equitable geographical distribution.