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2
-
On irrigation efficiencies / M.G. Bos, J. Nugteren.
- International institute for land reclamation and improvement,
- 1974.
- Wageningen :
-
Growth regulators in fruit production : bibliography of literature since 1972 / comp. by O. Borsboom and H. Jonkers.
- Landbouwhogeschool,
- 1974.
- Wageningen :