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2
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Participatory development of agricultural innovations : procedures and methods of on-farm research / Jürgen Werner.
- Deutsche Gesellschaft für technische Zusammenarbeit (GTZ) [etc.],
- 1993.
- Eschborn :
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Information systems for improved macroeconomic policy in developing countries : a review and evaluation of experience with special reference to German-sponsored technical assistance projects / James G. Bennett.
- Deutsche Gesellschaft für technische Zusammenarbeit (GTZ) [etc.],
- 1993.
- Eschborn :