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  1. 1
    published 1976
    Book Conference Proceedings
  2. 2
  3. 3
    published 1967
    Book
  4. 4
  5. 5
  6. 6
  7. 7
    by Cramer, Franz
    published 1907
    Book
  8. 8
    published 1976
    Book
  9. 9
    published 1980
    Book
  10. 10
    published 1980
    Book
  11. 11
    published 1954
    Book Still Image Illustrated Book
  12. 12
  13. 13
    by Ehrlich, Willi
    published 1968
    Book
  14. 14
    by Philippi, Adolf
    published 1908
    Book
  15. 15
  16. 16
    published 1954
    Book
  17. 17
  18. 18
    by Schäfer, Georg
    published 1891
    Book
  19. 19
  20. 20