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Optimizing yields : the role of fertilizers : proceedings of the 12th IPI-congress, June 1982 at Goslar, Federal republic of Germany
- International potash institute,
- 1982.
- Bern :
-
Physiological aspects of crop productivity : proceedings of the 15th colloquium of the International potash institute, held in Wageningen, 1980 / [contrib. by F.G.H. Lupton...et al.].
- International potash institute,
- 1980.
- Bern :
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Proceedings: Twelfth International Penal and Penitentiary Congress / Thorsten Sellin.
- 345
- Sellin, Thorsten.
- International Penal and Penitentiary Commission,
- 1951.
- Bern :