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Results of experiments with slotted wings (1924)
NASA Technical Reports Server (NTRS) · leaf 27
Fig. 14 N.A.C.A. Technical Memorandum No. 282 … Fig. 14 Conversion of a two-slotted wing section into a staggered triplaneNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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