Inside Out Library · Explore
Analysis of flight and wind-tunnel tests on Udet airplanes with reference to spinning characteristics (1929)
NASA Technical Reports Server (NTRS) · leaf 27

NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
More pictures from Analysis of flight and wind-tunnel tests on Udet airplanes with reference to spinning characteristics
More like this