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The Behm Acoustic Sounder for Airplanes with Reference to Its Accuracy (1930)

NASA Technical Reports Server (NTRS) · leaf 23

An illustration from The Behm Acoustic Sounder for Airplanes with Reference to Its Accuracy, 1930, leaf 23

NASA Technical Reports Server (NTRS)

Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.

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