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3
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Adaptation of barley to harsh Mediterranean environments / Erik van Oosterom.
- s.n.],
- 1993.
- [S.l. :
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Natural control of Helicoverpa armigera in smallholder crops in East Africa / Henk van den Berg.
- s.n.],
- 1993.
- [S.l. :
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The interplay of economics and politics in the transformation of social systems / by Jan S. Prybyla.
- s.n.],
- 1993.
- [S.l. :