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Wind-tunnel investigation of NACA 23012 airfoil with various arrangements of slotted flaps (1939)
NASA Technical Reports Server (NTRS) · leaf 4
AN N. A. C. A. 23021 AIRFOIL WITH SLOTTED FLAPS 209142—10 iiNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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