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a Except for these items, all figures are current billion dollars.
SOURCE: U.S. Department of Commerce, U.S. Industrial Outlook 1993 (Washington, D.C.: U.S. Government Printing Office, 1992); National Science Board, Science and Engineering Indicators: 1991 Edition (Washington, D.C.: U.S. Government Printing Office, 1991), and National Science Board, The Competitive Strength of U.S. Industrial Science and Technology: Strategic Issues (Washington, D.C.: U.S. Government Printing Office, August 1992).
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