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Potassium = Potasio = Kalium Symposium 1957 : papers read at the fourth congress of the International potash institute (4 sessions), Vienna 1957 / [Beitr. von W. Krause...et al.].
- International potash institute,
- 1957.
- Berne :
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Japanese potassium symposium : nine papers read at the first Japanese potassium congress, Tokyo 1957 / [contrib. by K. Kobo...et al.].
- 852
- International potash institute,
- 1958.
- Berne :
-
The oil palm, its culture, manuring and utilisation / by Ng Siew Kee.
- International potash institute,
- 1972.
- Berne :