The Census Bureau provides a concordance between the SIC and NAICS industry classifications on their web site (https://www.census.gov/eos/www/naics/concordances/concordances.html). For both the 1992 and 1997 tables, BEA provides a concordance between the codes used in the I-O tables and the Census industry (SIC or NAICS) classification. The concordance for 1997 is available in Appendix A of the article “Benchmark Input-Output Accounts of the United States, 1997,” in the Survey of Current Business (SCB), December 2002, available online at http://www.bea.gov/scb/pdf/2002/12December/1202I-OAccounts2.pdf. A concordance for 2002 is available in Appendix A of the article “U.S. Benchmark Input-Output Accounts, 2002” in the SCB, October 2007, available online at http://www.bea.gov/scb/pdf/2007/10%20October/1007_benchmark_io.pdf.