Inside Out Library · ExploreHeat transfer from cylinders having closely spaced fins (1937)NASA Technical Reports Server (NTRS) · leaf 15H.A.C.A. Teohnlaal Vote Ho. 603 Tigs. 5*,b,oNASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from Heat transfer from cylinders having closely spaced finsMore like this