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2
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Seed ecology of Striga hermonthica : a field study on germination and viability of Striga hermonthica seeds in western Kenya during the rainy season of 1995 / Nick den Hollander.
- Vrije universiteit,
- 1996.
- Amsterdam :
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Sustainable nutrient management in agriculture : a simulation programme for calculating field level plant nutrition recommendations / Albert Hekstra.
- Stichting mondiaal alternatief,
- 1996.
- Amsterdam :