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  1. 31
    by Leokum, Arkady
    Published 1972
    Book

    Lots more tell me why answers to hundreds of questions children ask
  2. 32
    by Dever, Esther
    Published 1970
    Book

    Sources of free and inexpensive educational materials
  3. 33
    by Snow, Charles Percy
    Published 1969
    Book

    The two cultures and a second look :an expanded version of the two cultures and the scientific revolution
  4. 34
    Published 1964
    Book

    The World book encyclopedia
  5. 35
    Book

    Grolier encyclopedia of knowledge.
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