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  1. 1
    Phosphoric acid, phosphates and phosphatic fertilizers
    by Woggaman, W H
    Published 1955
    Printed Book
  2. 2
    Biofertilizers in agriculture
    by Subha Rao, N S
    Published 1988
    Printed Book
  3. 3
    Nitrogen fixation : proceedings of the phytochemical society of Europe Symposium, sussex, September, 1979
    by Stewart, W D P
    Published 1980
    Printed Book
  4. 4
    Nitrogen fertilizers
    by Korenkov, D A
    Published 1983
    Printed Book
  5. 5
    Statistics of crop responses to fertilizers
    Published 1966
    Printed Book
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