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Report of the first all-African seminar on the human environment : jointly sponsored by the Economic commission for Africa and the United Nations secretariat, Geneva (Addis-Ababa, 23-28 August 1971) / UN. Economic commission for Africa.
- 86
- UN. Economic and social council,
- 1971.
- Addis Ababa, Ethiopia :
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Report of the panel of experts on advanced institutes for applied science and technology in Africa, Manchester, 10-14 August 1970 / Economic commission for Africa, United Nations economic and social council.
- 86
- UN. ECA,
- 1971.
- Addis Ababa, Ethiopia :