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International symposium on the production and certification of seed potatoes : a contribution to the FAO world seed campaign : Wageningen, the Netherlands, 12 June-1 July 1961
- International agricultural centre,
- 1961.
- Wageningen :
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The soils of the lower eastern slopes of the Cameroon mountain and their suitability for various perennial crops / door H.N. Hasselo.
- 863.2
- Veenman,
- 1961.
- Wageningen :