Some general search terms to get you started:
Industry classifications used by industry and government agencies.These can be used in searching an industry.
Common codes:
SIC Codes:
NAICS Codes:
This is a tutorial (from UST Librairies on how to read MRI+ Mediamark Reporter data. (See instructions below for creating an account. Note: You will need a code to create the account. Obtain the code from your instructor.)