Inside Out Library · ExploreThe Effects of Surface Waviness and of Rib Stitching on Wing Drag (1939)NASA Technical Reports Server (NTRS) · leaf 12NASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from The Effects of Surface Waviness and of Rib Stitching on Wing DragMore like this
