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2
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Linking small-scale farmers to markets : a multi-level analysis with special references to Malawi, Kenya and South Africa / Stefan Canz.
- Margraf,
- cop. 2005.
- Weikersheim :
-
Integrated pest management of the potato tuber moth in cropping systems of different agro-ecological zones / Stefan Keller.
- Margraf,
- cop. 2003.
- Weikersheim :