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Amazon soils : a reconnaissance of the soils of the Brazilian Amazon region / W.G. Sombroek ; with a forew. by P. Lemos de Oliveira.
- 878.4
- Centre for agricultural publications and documentation,
- 1966.
- Wageningen :
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Drainage of agricultural land : a bibliography / comp. by C.A. de Vries and B.C.P.H. van Baak.
- International institute for land reclamation and improvement (ILRI),
- 1966.
- Wageningen :