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High velocity wind tunnels : their application to ballistics, aerodynamics, and aeronautics (1925)
NASA Technical Reports Server (NTRS) · leaf 38
Fig.23 N.A.C.A. Technical Memorandum Noi318 500 … Fig. 22 Curve showing increase in maximum speed of airplanes VNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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