The history of the XV-15 tilt rotor research aircraft : from concept to flight / Martin D. Maisel, Demo J. Giulianetti, and Daniel C. Dugan.
Imprint
Washington, D.C. : National Aeronautics and Space Administration, Office of Policy and Plans, NASA History Division : For sale by the U.S. G.P.O., Supt. of Docs., 2000.
