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Sustainability in terms of nutrient elements with special reference to West-Africa / N. van Duivenbooden.
- CABO-DLO,
- 1992.
- Wageningen :
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Opportunities for soya beans after rice in the Philippines : an exploration by simulation / F.W.T. Penning de Vries...[et al.].
- CABO-DLO,
- 1992.
- Wageningen :