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Investigation of certain wing shapes with sections varying progressively along the span (1931)
NASA Technical Reports Server (NTRS) · leaf 50
N.A.C.A. Technical Memorandum Ho.617 <igs.l4,15 Nl X o lo rH O o M Cu rH O Pn LO rH 50* •HNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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