Soule, H A & Hootman, James A. Flight tests of an airplane showing dependence of the maximum lift coefficient on the test conditions, report, November 1, 1937; (https://digital.library.unt.edu/ark:/67531/metadc54381/m1/1/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .