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Measurements of vertical air currents in the atmosphere (1931)
NASA Technical Reports Server (NTRS) · leaf 14
N.A.C.A. Technical Memorandum No,648 Pigs.7,10,11 | fen i ifcitm •HNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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