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Agro-ecological characterization for potato production : a simulation study / W. Stol...[et al.].
- Centre for agrobiological research. Agricultural research department,
- 1991.
- Wageningen :
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Development of a simulation model for the management and exploitation of perennial grasses in the Sahel-Sudan zone / H.R. Ukkerman.
- Centre for agrobiological research. Agricultural research department,
- 1991.
- Wageningen :
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Bio-economic capability of West-African drylands / J. Wolf, H. Breman and H. van Keulen.
- Centre for agrobiological research. Agricultural research department,
- 1991.
- Wageningen :