The 1997 table was the first Benchmark I-O table to convert from SIC to NAICS classification.  For an overview of the NAICS and SIC systems and how they impact the Benchmark IO Table, see the December 2002 Survey of Current Business (SCB) article, “Benchmark Input-Output Accounts of the United States, 1997,” available online at http://www.bea.gov/scb/pdf/2002/12December/1202I-OAccounts2.pdf.

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