United Nations. Economic and Social Council; United Nations. Economic Commission for Africa; UN. ECA Extraordinary Intergovernmental Expert Group Preceding the conference of African Ministers of Trade Preparatory Meeting (6th session: 1983, Feb.18 - 23 : Libreville, Gabon); ECA Conference of African Ministers of Trade (1983, Feb.18 - 23: Libreville, Gabon); UNCTAD (6th session: 1983, Feb.18 - 23: Libreville, Gabon) (1983-01)