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2
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Sustainability in agricultural and rural development / ed. by Gerard E. D'Souza, Tesfa G. Gebremedhin.
- Ashgate,
- cop. 1998.
- Aldershot [etc.] :
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Social development in Africa, 1950-1985 : methodological perspectives and future prospects / Arega Yimam.
- Avebury,
- 1990.
- Aldershot [etc.] :