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NAICS Code Search
http://www.census.gov/epcd/www/naics.html
North American Industry Classification System (slated to replace SIC). Allows users to convert SIC to NAICS and vice versa.
Subjects:   Industry Research  

SIC Code Search
http://www.osha.gov/oshstats/sicser.html
Simple search tool to find the Standard Industrial Classification (SIC) Code for any industry, based on a keyword, or to find the industry description for a known SIC code.
Subjects:   Industry Research