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  1. 11
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  5. 15
    Published 1971
    Book
  6. 16
    by Inhelder, Bärbel
    Published 1968
    Book
  7. 17
    by Soubiran, Andre 1910-
    Published 1967
    Book
  8. 18
  9. 19
    Published 1964
    Book
  10. 20
    by Heiser, Victor George 1873-
    Published 1938
    Book