U.S. Census Bureau, 2017 NAICS Structure (workbook 2017_NAICS_Structure.xlsx) (Jan. 1, 2017) (Ex. LAW-401)
U.S. Census Bureau, 2-6 digit 2017 Code File (workbook 2-6 digit_2017_Codes.xlsx) (Jan. 1, 2017) (Ex. LAW-402)
U.S. Census Bureau, 2017 NAICS Structure Summary Table (workbook 2017_NAICS_Structure_Summary_Table.xlsx) (Jan. 1, 2017) (Ex. LAW-403)
