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  1. 1
    Published 1981
    Continuing Resource
  2. 2
    Published 1979
    Continuing Resource
  3. 3
    by Hughes, Douglas A.
    Published 1975
    Continuing Resource
  4. 4
    Published 1972
    Continuing Resource
  5. 5
    Published 1966
    Continuing Resource
  6. 6
    Published 1940
    Continuing Resource
  7. 7
    Continuing Resource
  8. 8
    Continuing Resource
  9. 9
    Continuing Resource
  10. 10
    Continuing Resource