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High velocity wind tunnels : their application to ballistics, aerodynamics, and aeronautics (1925)
NASA Technical Reports Server (NTRS) · leaf 37
Fig8.18,19,20A21. N.A.a.A. Technical Yemoranduxt No.318 Fig,30 Shook wavo of shell 1,A. Scale 0.667 I Z^(S A. S.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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