Description: Secretary-General of the United Nations, Dag Hammarskjöld, greeting Emperor Haile Selassie I in Addis Ababa, 29 December 1958, ahead of the inaugural session of the Economic Commission for Africa. At centre back is the first ECA Executive Secretary, Mekki Abbas. Image: Secretary-General of the United Nations, Dag Hammarskjöld, greeting Emperor Haile Selassie I in Addis Ababa, 29 December 1958, ahead of the inaugural session of the Economic Commission for Africa. At centre back is the first ECA Executive Secretary, Mekki Abbas. Description: FIRST SESSION OPENS: Emperor Haile Selassie I delivering his speech to open the first session of the Economic Commission for Africa in the parliament building in Addis Ababa, 29 December 1958. Image: FIRST SESSION OPENS: Emperor Haile Selassie I delivering his speech to open the first session of the Economic Commission for Africa in the parliament building in Addis Ababa, 29 December 1958. Description: Resolution 671A (XXV-1) adopted by the Economic and Social Council at its 1017th meeting held on 29 April 1958 and amended by the Council at its twenty-sixth session. Image: Resolution 671A (XXV-1) adopted by the Economic and Social Council at its 1017th meeting held on 29 April 1958 and amended by the Council at its twenty-sixth session. Description: The second ECA Executive Secretary, Robert K.A Gardiner of Ghana, demonstrating the model of the ECA Building to Emperor Haile Selassie I. Image: The second ECA Executive Secretary, Robert K.A Gardiner of Ghana, demonstrating the model of the ECA Building to Emperor Haile Selassie I. Description: Memorandum of understanding-Ethiopia- United Nations: The memorandum of understanding agreement signed between ECA and the Ethiopian Government on 18 June 1958 regarding the establishment of the Commission’s Headquarters in the country’s capital Addis Ababa. Image: Memorandum of understanding-Ethiopia- United Nations: The memorandum of understanding agreement signed between ECA and the Ethiopian Government on 18 June 1958 regarding the establishment of the Commission’s Headquarters in the country’s capital Addis Ababa. Description: Subregional presence: Official opening of the ECA Subregional Office for Central Africa (SRO-CA), Léopoldville, Democratic Republic of the Congo on16 April 1966. Shown cutting the symbolic ribbon is President, Mobutu Sese Seko. Image: Subregional presence: Official opening of the ECA Subregional Office for Central Africa (SRO-CA), Léopoldville, Democratic Republic of the Congo on16 April 1966. Shown cutting the symbolic ribbon is President, Mobutu Sese Seko. Description: Secretary-General, Dag Hammarskjöld, inspecting the Guard of Honour at the Addis Ababa Airport, 28 December 1958, ahead of the inaugural session of the Economic Commission for Africa, which was held on 29 December 1958. Image: Secretary-General, Dag Hammarskjöld, inspecting the Guard of Honour at the Addis Ababa Airport, 28 December 1958, ahead of the inaugural session of the Economic Commission for Africa, which was held on 29 December 1958.