Axial Fatigue Test at Two Stress Amplitudes of 0.032-Inch 24S-T Sheet Specimens With a Circular Hole, report, July 1945; (https://digital.library.unt.edu/ark:/67531/metadc54758/m1/1/: accessed April 20, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .