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Lecture on the Rhon soaring flight competition, 1921 (1922)
NASA Technical Reports Server (NTRS) · leaf 29
II "Black Devil, A 29. "Brenner", inflight, G 43. *ne; of Aeronautical Society of Stuttgart.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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