Industry Standards Used as Data Keys and Values
Generally available public standards such as Standard Industrial Classifications (SIC) and North American Industry Classification System (NAICS) are not maintained in this document. Some of the popular websites that describe and are used to maintain and access SIC and NAICS information are listed here.
SIC codes listed by the United States Department of Commerce: http://www.sec.gov/info/edgar/siccodes.htm
NAICS codes listed by the United States Security and Exchange Commission: http://www.census.gov/eos/www/naics/
Wikipedia North American Industry Classification System: http://en.wikipedia.org/wiki/North_American_Industry_Classification_System