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Preliminary Report on Laminar-Flow Airfoils and New Methods Adopted for Airfoil and Boundary-Layer Investigations (1939)
NASA Technical Reports Server (NTRS) · leaf 27
Figure 2.- Preliminary form of laminar-flow airfoil, (NACA 25 B 09-46).NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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