Matrix containing code lengths to use for nomenclatures of various product classification schemes
A 14 by 6 matrix, with columns indexed by lengths (1 through 6) and rows named
Data consolidated from - World Integrated Trade Solution (WITS), World Bank (http://wits.worldbank.org/product_concordance.html) - UN Statistics Division (http://unstats.un.org/unsd/trade/conversions/HS - Schott and Pierce's site (http://faculty.som.yale.edu/peterschott/sub_international.htm)
See also Justin R. Pierce and Peter K. Schott, "Concording U.S. Harmonized System Codes Over Time".
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