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The Bureau of Labor Statistics is the principal fact-finding agency for the Federal Government in the broad field of labor economics and statistics.

North American Industry Classification System (NAICS) at BLS: Alphabetical order

Tool that provides demographic and economic data from the U.S. Census Bureau.

The Security & Exchange Commission's database, EDGAR (Electronic Data Gathering, Analysis, and Retrieval), provides free access to 10-Ks, 10-Qs, proxies, prospectuses, and other documents.

Resource guides for more than 400 industries, organized by SIC code.

Link to American Library Association's list of demographic data sources.