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  1. 1
    by Rocha, Helio Olympio da
    Published 1981
    Freiburg im Breisgau : Institut für Bodenkunde und Waldernährungslehre der Albert-Ludwigs-Universität Freiburg i. Br., 1981.
    iv, 189 p. : ill. ; 21 cm.
  2. 2
    by Sombroek, Wim G.
    Published 1966
    Wageningen, Centre for Agricultural Publications and Documentation, 1966.
    303 p. with illus. 7 fold. profiles (part col.) tables. 25 cm.

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