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The History of the XV-15 Tilt Rotor Research Aircraft: From Concept to Flight (The NASA History Series): Administration, National Aeronautics and Space, Maisel, Martin D., Guilianetti, Demo J., Dugan, Daniel C.: 9781493648689:
Bell Agusta BA609 - Price, Specs, Photo Gallery, History - Aero Corner
Bell Agusta BA609 - Price, Specs, Photo Gallery, History - Aero Corner
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AgustaWestland AW609 tiltrotor aims for 2016 FAA certification