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  2. 2
    by Eckert, Georg
    published 1948
    Book
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    published 1989
    Book Thesis
  8. 8
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  10. 10
  11. 11
  12. 12
  13. 13
    by Beck, Walter G.
    published 1968
    Book Thesis
  14. 14
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  17. 17
    by Boesch, Hans
    published 1952
    Book
  18. 18
  19. 19
  20. 20
    published 1968
    Book