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The Compressibility Bubble (1935)
NASA Technical Reports Server (NTRS) · leaf 21
8» Figure 10#- Schlieren flow photograph, VJLC«X 4412 airfoil; a=l° 52£'; V/Vc = 0.690NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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