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  1. 1
    Biofertilizers for sustainable agriculture
    by Sharma, Arun K
    Published 2004
    Printed Book
  2. 2
    Encyclopedia of organic farming-vol.iii
    by Howard ,Daniel
    Published 2008
    Printed Book
  3. 3
    Organics in soil health and crop production
    by Thampan, P.K
    Published 1993
    Printed Book
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