Books by Daniel C. Dugan:
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Dugan, Daniel C.: V/STOLAND Avionics System Flight-Test Data on a UH-1H Helicopter (Washington: National Aeronautics and Space Administration, Scientific and Technical Information Office, 1980), also by Fredric A. Baker, Dean N. Jaynes, Lloyd D. Corliss, Sam Liden, and Robert B. Merrick
Additional books by Daniel C. Dugan in the extended shelves:
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Dugan, Daniel C.: XV-15 tilt rotor research aircraft (National Aeronautics and Space Administration, Office of Policy and Plans, NASA History Division, 2000), also by Martin D. Maisel, Demo J. Giulianetti, and United States. National Aeronautics and Space Administration. History Office (page images at HathiTrust)
Find more by Daniel C. Dugan at your library, or elsewhere.