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The Sonic Altimeter for Aircraft (1937)
NASA Technical Reports Server (NTRS) · leaf 117
Fi«r.l9 N.A.C.A. Technical Note No. 611 … Ratio of frequencies Figure 19.- Intensity-frequency-pulse length chart.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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