Peiser, A. M. & Walker, W. G. An analysis of the airspeeds and normal accelerations of Boeing S-307 airplanes in commercial transport operation, report, September 1946; (https://digital.library.unt.edu/ark:/67531/metadc55014/m1/1/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .