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1
North American industry classification system : United States, 1997.
Published 1998Government Document Book -
2
North American industry classification system : United States, 2002 /
Published 2002Government Document Book -
3
North American industry classification system : United States, 2007 /
Published 2007Electronic version of Related Resources Only (Unrestricted access)
Government Document Book -
4
North American industry classification system : United States, 2012 /
Published 2012Electronic version of Related Resources Only (Unrestricted access)
Government Document Book