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  1. 61
  2. 62
    Published 1987
    Conference Proceeding Book
  3. 63
    Journal
  4. 64
    Published 2004
    Serial
  5. 65
    Published 1989
    Serial
  6. 66
    Published 1928
    Book
  7. 67
    by Horn, Arthur G.
    Published 1962
    Book
  8. 68
    Published 2000
    Book
  9. 69
  10. 70
    Published 1989
    Serial
  11. 71
  12. 72
    by Gunningham, Neil
    Published 2003
    Book
  13. 73
    Published 2001
    Journal
  14. 74
    Published 1967
    Book
  15. 75
  16. 76
  17. 77
    Published 1949
    Journal
  18. 78
    Published 1939
    Book
  19. 79
    Published 2010
    Serial
  20. 80
    Published 1954
    Book