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NOTES: The national totals for S&E doctorate holders in academia in the United States are provided by the National Science Foundation, National Center for Science and Engineering Statistics.

SOURCES: The Patent Board™, special tabulations (2013) from Thomson Reuters, Science Citation Index and Social Sciences Citation Index http://thomsonreuters.com/products_services/science/;┬áNational Science Foundation, National Center for Science and Engineering Statistics, Academic R&D Expenditure, Survey of Doctorate Recipients (various years).
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