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Structural details of German light airplanes (1930)
NASA Technical Reports Server (NTRS) · leaf 28
N.A.C.A. Technical Memorandum Nc. 579 Fig. 17 … Fig. 17 Raab-Katzenstein R K 25 airplaneNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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