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The 1929 Rhon soaring-flight contest (1930)
NASA Technical Reports Server (NTRS) · leaf 23
Technical Memorandum No.560 Figs.3,5,6,9,12,14,16 Fig.14 The glider "Darmatadt II". "Aachen MI".NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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