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Wind-tunnel tests on model wing with Fowler flap and specially developed leading-edge slot (1933)
NASA Technical Reports Server (NTRS) · leaf 20
Fig. 6 N.A.C.A. Technical Note No.459 … paoqo jo juaoaajNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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