Berkebile, Philip A. [Letter from Philip A. Berkebile to Bill Cornwell, October 4, 2004], letter, October 4, 2004; (https://digital.library.unt.edu/ark:/67531/metadc1452885/m1/2/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .