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Twelfth Rhon soaring contest, 1931 (1932)
NASA Technical Reports Server (NTRS) · leaf 20
Fig.8 Groenhcff in Fafnir,afternoon of Aiigust 1, 1931, towed etart,released at 1460 m(4G00 ft.), scale 1:50000 (altitude 10 times).NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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