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  1. 1
    Handbook of soil, fertilizer and manure
    por Gupta,P.K
    Publicado 2007
    Printed Book
  2. 2
    Soils and soil fertility
    por Troeh, Frederick R
    Publicado 2008
    Printed Book
  3. 3
    Factors of soil formation: a system of quantitative pedology
    por Jenny, Hans
    Publicado 1941
    Printed Book
  4. 4
    Soil and geomorphology/
    por Peter W Birkeland
    Publicado 1999
    Printed Book
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