United Nations. Economic and Social Council; United Nations. Economic Commission for Africa; UN. ECA Conference of Ministries of the Commission (18 session, 9th : 1983, April 27 - May 3 : Addis Ababa, Ethiopia); UN. ECA Technical Preparatory Committee of the Whole Meeting (4th : 1983, Apr. 14-22 : Addis Ababa, Ethiopia); UN. ECA Conference of Ministers of the Commission (9th : Apr. 27-May 3 : Addis Ababa, Ethiopia) (1983-02)