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  1. 31
    by Paterson, John Waugh
    Published 1960
    Book

    Science in agriculture a discussion of scientific principles in their relation to farm practice adopted for the use of schools and colleges
  2. 32
    Published 1959
    Book

    Philippine agriculture
  3. 33
    by Cook, James Gordon
    Published 1957
    Book

    The fight for food
  4. 34
    by Osborn, Fairfield
    Published 1948
    Book

    Our plundered planet.
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