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  1. 1
    Seed identification manual
    by Barkley, William D
    Published 1961
    Printed Book
  2. 2
    Compendium of Indian weed science research V.2 : weeds and weedicides
    Printed Book
  3. 3
    Scientific Principles of Plant Protection
    by Martin, Hubert
    Published 1959
    Printed Book
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