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  1. 1
    by Schweickart, David
    Published 2011
    Book
  2. 2
    by Sison, Jose Maria 1939-
    Published 2009
    Book
  3. 3
    by Schweickart, David
    Published 2002
    Book
  4. 4
  5. 5
    by Guerin, Daniel 1904-
    Published 1973
    Book
  6. 6
  7. 7
    by Eaton, John 1909-
    Published 1966
    Book