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Proceedings of the fourth international congress on soilless culture, Las Palmas, 25 October 1976 - 1 November 1976 / [with contrib. by A.A. Steiner...et al.].
- International working group on soilless culture (IWOSC),
- 1977.
- Wageningen :
-
L'agriculture tunisienne : analyse d'une économie en voie de modernisation / door Rudolf Gerardus Antonie Kool.
- 861.4
- Veenman,
- 1963.
- Wageningen :
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Tropical agriculture and economic development / by Rudolf Kool.
- Veenman,
- cop. 1960.
- Wageningen :