Salters, Leland B., Jr. & Norton, Harry T., Jr. An Investigation of the Effect of the WADC 30,000-Horsepower Whirl Rig Upon the Static Characteristics of a Propeller, report, July 2, 1952; (https://digital.library.unt.edu/ark:/67531/metadc64716/m1/1/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .