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The Standard Industrial Classification (SIC) is a U.S. system for classifying industries by a 4-digit code. In most cases it is being replaced by the more recent 6-digit North American Industry Classification System (NAICS). Many databases will let you search by SIC and/or NAICS code, so it can be helpful to know the code(s) for the industries you are interested in.
Doing Business In... reports are country by country analysis of the environment for starting and operating businesses.