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  1. 1
  2. 2
    published 1974
    Book
  3. 3
  4. 4
    by Wilhelm, Pia
    published 1975
    Book
  5. 5
    published 1989
    Book
  6. 6
  7. 7
    by Jendritzki, Hans
    published 1982
    Book
  8. 8
  9. 9
  10. 10
    by Wallenta, Wolfgang
    published 2017
    Book
  11. 11
    published 1994
    Book
  12. 12
  13. 13
  14. 14
    by Fritz, Rolf
    published 1950
    Book Special Print
  15. 15
    by Smith, Eric
    published 1983
    Book
  16. 16
  17. 17
  18. 18
  19. 19
  20. 20