In our print Reference Collection:
California Manufacturers Register
Directory of California Wholesalers and Service Companies
Encyclopedia of American Industries
Manufacturing & Distribution USA
North American Industry Classification System. United States
Industry Economic Accounts
Current and historical statistics from the Bureau of Economic Analysis for GDP by industry, research and development, and input-output.
The full list of North American Industry Classification System codes.
Statistics for Specific Industries
This U.S. Small Business Administration website is a gateway to statistics sources for major industry sectors in the U.S.