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"Villiers 24" slotted-wing airplane (French) (1928)
NASA Technical Reports Server (NTRS) · leaf 15
0 N.A.d".A. Aircraft Circular No.87 Fig. 10 500 … Fig.10 Polar curves for profile A-5,Velocity 40m/8. St.Oyr laboratory.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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