Industries  

Business Source Premier
Has Datamonitor reports that feature company and industry profiles.  Tip:  Type industry name in search bar and choose 'Industry Profiles.'   

IBISWorld
U.S. industry reports by NAICS codes. Covering industry life cycle, supply chain, products & markets, competitive environment, operating conditions etc.

S & P NetAdvantage
A rich source for industry-level information. Overviews of major industry groups in the U.S.  Includes industry trends, how the industry operates, key ratios and statistics.  Tip:  Click on the 'Industries' tab at the top of the screen.

NAICS (North America Industrial Classification System)
Locate industry information such as revenues and employment via this classification system.  Every industry has a NAICS number which can be located at the NAICS site.  Tip:  To find information about car dealers, locate the NAICS number by typing 'autos' in the search bar on the upper left side of the NAICS homepage.  To see information on this industry, go to Google and type: naics #.   The first search result will be a page from the U.S. Census Bureau with industry information.  European industrial classification system is known as NACE.

In print format:  NAICS, 2002 338.02012 Reference Mgmt/ Schaffner

For further pointers on how to conduct research using the Economic Census, consider:
Industry Research Using the Economic Census: How to Find It, How to Use It   338.0973 E197Zb Ref Mgmt / Schaffner