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2
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Current world fertilizer situation and outlook 1986/87-1992/93 / prep. by J.W. Couston.
- Food and Agriculture Organization of the United Nations,
- 1988.
- Rome :
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Recalcitrant seeds : a status report / by H.F. Chin ; including a bibliography 1979-87, by H.W. Pritchard.
- International board for plant genetic resources (IBPGR),
- 1988.
- Rome :