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  1. 41
    Published 1970
    Book
  2. 42
    by Gerboth, Walter
    Published 1969
    Book
  3. 43
  4. 44
    by Mitchell, William John 1906-
    Published 1967
    Book
  5. 45
    by Heckmann, Harald
    Published 1967
    Book
  6. 46
  7. 47
    Published 1964
    Book
  8. 48
    by Merriam, Alan P. 1923-1980
    Published 1964
    Book
  9. 49
    by Harrison, frank Llewellyn
    Published 1963
    Book
  10. 50
  11. 51
    by Allen, Warren Dwight 1885-
    Published 1962
    Book
  12. 52
    Published 1961
    Book
  13. 53
    by Magyar Tudományos Akadémia
    Published 1961
    Continuing Resource
  14. 54
  15. 55
    by Danielou, Alain
    Published 1959
    Book
  16. 56
  17. 57
  18. 58
    by Garrett, Allen McClain 1924-
    Published 1958
    Book
  19. 59
    by Mendel, Arthur 1905-
    Published 1957
    Book
  20. 60