Scudder, N. F. A Flight Investigation of the Effect of Mass Distribution and Control Setting on the Spinning of the XN2Y-1 Airplane, report, January 10, 1934; (https://digital.library.unt.edu/ark:/67531/metadc66141/m1/1/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .