Data Sources
- American Association of Retired Persons (AARP)
- Boston College Center for Retirement Research
- Census of Manufacturers
- IMPLAN
- National Center for Educational Statistics
- National Science Foundation
- North American Industrial Classification System (NAICS)
- Tax Foundation
- U.S. Bureau of Economic Analysis
- U.S. Department of Commerce International Trade Administration
- U.S. Department of Transportation Center for Transportation Statistics
- U.S. Department of the Census
- U.S. Department of the Census 2012 Statistical Abstract
- U.S. Internal Revenue Service
- U.S. Patent and Trademark Office