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Behm Acoustic Sounder for Aircraft (1926)
NASA Technical Reports Server (NTRS) · leaf 6
N.A.C.A, Teoiinicai Memcrandam ^o.^46 Fx^ Fig.l Bohm air-sounaer Fig,3 Behm sending and on airplane. receiving apparatuoNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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