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    Published 2014
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    Published 2005
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    Published 2000
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    Published 1992
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    Published 1990
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    Published 1986
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  8. 8
    Published 1973
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  9. 9
    Published 1966
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  12. 12
    Published 1941
    Continuing Resource
  13. 13
    Published 1939
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  14. 14
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  15. 15
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  17. 17
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