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The "Potez 39" observation airplane (French) : an all-metal high-wing two-seat monoplane (1930)
NASA Technical Reports Server (NTRS) · leaf 8
Figs.1,4,5.6,7. N.A.C.A. Aircraft Circular Ho.114 Pig.4 Diagram of fuselage and sections of members used.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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