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Structural details of German gliders (1927)
NASA Technical Reports Server (NTRS) · leaf 39
Figs.l9,2G,21 N.A.C.A. Teclmical M:;morandum No,i:39 Sp-^r fitting;. Fig.21NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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