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Structural details of German gliders (1927)
NASA Technical Reports Server (NTRS) · leaf 48
N.A.O.A. Teclmicr.l Monorandurn No.439 Figs.54, 55, 56, 57, 53, 59 … Fig.59 Ilesenann's combination.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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