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Wind-tunnel investigation of NACA 23012, 23021, and 23030 airfoils with various sizes of split flap (1939)
NASA Technical Reports Server (NTRS) · leaf 7
REPORT NO. 668—NATIONAL ADVISORY COMMITTEE FOR AERONAUTICSNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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