Energy exploration and development trends in developing countries : report of the Secretary-General.
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English:A_41_383--E_1986_101-EN - PDF ; Русский:A_41_383--E_1986_101-RU - PDF ; العربية:A_41_383--E_1986_101-AR - PDF ; 中文:A_41_383--E_1986_101-ZH - PDF ;