Amazon soils : a reconnaissance of the soils of the Brazillian Amazon region /
W.G. Sombroek.
- Wageninger : Centre for Agricultural Publications and Documentation, 1966.
- 292 p. : illus., 7 fold. maps (part col.).
- (Agricultural research reports, 672). .
Part of the illustrative matter in pocket. Summary in Portuguese. Author's thesis, State Agricultural University, Wageningen (Netherlands) Errata slip inserted.