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  1. 1
    by Singer, Richard G.
    Published 2018
    Book
  2. 2
    by Singer, Richard G
    Published 2013
    Book
  3. 3
    by Singer, Richard G
    Published 2007
    Book
  4. 4
    by Singer, Richard G
    Published 2004
    Book
  5. 5
    by Singer, Richard G
    Published 2001
    Book
  6. 6
    by Singer, Richard G
    Published 2010
    Book