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Ground Effect on the Take-off and Landing of Airplanes (1935)
NASA Technical Reports Server (NTRS) · leaf 36
Fig. 7 1T.A.C.A. Technical Memorandum No. 771 … Fi<5ure 7.- Airplane 287^.:E7in£ 215NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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