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NPA Data Services: Model of U.S. economic growth (Version 91.A) : technical description, pc software, data disks (NPA Data Services, 1991), also by Nestor E. Terleckyj, Charles DeWitt Coleman, and David M. Levy (page images at HathiTrust) NPA Data Services: NEPS (NPA Data Services, Inc., in the 20th century) (page images at HathiTrust; US access only)See also what's at your library, or elsewhere.
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