Fisher, Lloyd J. & Thompson, William C. Ditching Investigation of a 1/18-Scale Model of the North American B-45 Airplane, report, December 22, 1949; (https://digital.library.unt.edu/ark:/67531/metadc65517/m1/1/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .