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Twelfth Rhon soaring contest, 1931 (1932)
NASA Technical Reports Server (NTRS) · leaf 17
N.A.C.A. Technical Memorandiam No.671 Fig. 2 Fig.2 Flights wltli "Qchsenberg" near Vacha as fixed desti- nation.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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