Inside Out Library · ExploreRelative Economy of Different Methods of Airplane Construction (1931)NASA Technical Reports Server (NTRS) · leaf 53H.A.C.A. Technical Memorandum No.618 Figs. 12 ,13,14,15,16,17, 18 Fig.15 Fig.18NASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from Relative Economy of Different Methods of Airplane ConstructionMore like this
