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The Boeing mail airplane (1927)

NASA Technical Reports Server (NTRS) · leaf 5

An illustration from The Boeing mail airplane, 1927, leaf 5
N.A.C A. Aircraft Circular No.52 Fig.l Fig.l The Boeing Mail airplame

NASA Technical Reports Server (NTRS)

Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.

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