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Airborne trailblazer

Wallace, Lane E., 1961-
Washington, D.C. : National Aeronautics and Space Administration, NASA History Office : For sale by the Supt. of Docs., U.S. G.P.O., 1994. 1994

The history of the XV-15 tilt rotor research aircraft : from concept to flight

Maisel, Martin D.
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. 2000