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Theory of flapping flight (1925)
NASA Technical Reports Server (NTRS) · leaf 12
Figs.1,2 & 4 N.A.O.A. Technical Memorandum Ho.334 Fig.l Horizontal °lrection &i* tin*, x°n of fijg^£ w Fig. 2 … Fig.4NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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