Inside Out Library · ExploreExperimental Investigation of the Problem of Surface Roughness (1937)NASA Technical Reports Server (NTRS) · leaf 50Pig. U H.A.C.A. Technical Memoranda No. 823NASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from Experimental Investigation of the Problem of Surface RoughnessMore like this
