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Nieuport-Delage 640 (French) : commercial high-wing monoplane (1929)
NASA Technical Reports Server (NTRS) · leaf 8
N.i.O.A. Aircraft Circular No.92 Fig.l Fig.l The Kieuport-Delage type 640 commsrcial airplaneNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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