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A comparative analysis of agricultural extension systems of eight East African countries : with suggested guidelines for improvement / United Nations economic commission for Africa, Food and agriculture organization of the United Nations.
- United Nations. ECA [etc.],
- 1971.
- Addis Ababa :
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Science and mass media I : report of the Kampala seminar on science and mass media, Kampala, 23-27 November, 1970
- 86
- United Nations. Economic and social council,
- 1971.
- Addis Ababa :