Lippisch, A. Technical Report of the 1928 Rhon Soaring-Flight Contest. Washington, May 1929. Technical Memorandum, National Advisory Committee for Aeronautics, No. 514. 12pp plus one photo of 10 gliders and 4 pages of 2-view drawings of the various glider models, 8.5x11", stapled. Fair; one vertical fold and light cover toning.
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