Lehr, Robert R.; Kinghorn, George F. & Guryansky, Eugene R. Cooling Investigation of a B-24D Engine-Nacelle Installation in the NACA Full-Scale Tunnel, report, November 1942; (https://digital.library.unt.edu/ark:/67531/metadc62117/m1/1/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .