March 31, 1959.
DEVELOPMENT OF FIXED WING VTOL AIRCRAFT TYPE WITH TILTING PROP-ROTORS BELL XV-3 | eBay
March 31, 1959. This mostly relates to the BELL XV-3 VTOL aircraft. Presumably this was an Institute Paper or for a Presentation at a Bell Helicopter event. 20 pages of text, followed by 12 pages of photographs, drawings and graphs.
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