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  1. 1
    Published 1973
    Book
  2. 2
    by Taylor, Gordon Rattray
    Published 1968
    Book
  3. 3
    by Arnold, Robert E.
    Published 1973
    Book
  4. 4
    by Baldwin, Victor L.
    Published 1973
    Book
  5. 5
    by Asimov, Isaac, 1920-1992
    Published 1973
    Book
  6. 6
    Book