Oswalt, Noel R. & Boyd, M. B. Filling and Emptying System, Cordell Hull Navigation Lock: Cumberland River, Tennessee: Hydraulic Model Investigation, report, September 1966; (https://digital.library.unt.edu/ark:/67531/metadc303886/m1/1/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .