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Land use analysis using multiple goal linear programming : a course manual / M.K. van Ittersum...[et al.].
- DAN-UAW [etc.],
- 1997.
- Wageningen [etc.] :
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The impact of land degradation on food productivity : case studies of Uruguay, Argentina and Kenya / S. Mantel, V.W.P. van Engelen.
- International soil reference and information centre (ISRIC) [etc.],
- 1997.
- Wageningen [etc.] :