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A New Principle of Sound Frequency Analysis (1932)
NASA Technical Reports Server (NTRS) · leaf 16
A NEW PKINCIPLE OF SOUND FREQUENCY ANALYSIS 15 U. S. GOVERNMrNT PRINTING OFFICE: t33tNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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