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Theory of automatic control of airplanes (1939)
NASA Technical Reports Server (NTRS) · leaf 48
Figs. 2,3 N.A.C.A. Technical Note No. 70O 1 Figure 3,- Effect of displacement control on period and damping of phueoid.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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