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  1. 1

    Vermibiotechnology : From soil health to human health by Ranganathan, L.S

    Published 2006
  2. 2

    Hand book of soil, fertilizer and manure by Gupta,P.K

    Published 1999
  3. 3

    Basic concepts of soil science by Kolay, A. K

    Published 2002
  4. 4

    Soils and fertilizers by Macself A.J

    Published 2007
  5. 5

    Soils and crops : diagnostic techniques by Kitchen, Herminie B

  6. 6

    Rocks and soil by Rissman, Rebecca

    Published 2014