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  1. 1
    Published 1994
    Book

    The biological management of tropical soil fertility
  2. 2
    Published 1978
    Book

    Soil-resource data for agricultural development
  3. 3
    by Sanchez, Pedro A. 1940-
    Published 1976
    Book

    Properties and management of soils in the tropics
  4. 4
    by Buringh, P.
    Published 1970
    Book

    Introduction to the study of soils in tropical and subtropical regions
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