Mehan, Ray I. [Letter from Ray I. Mehan to Midwest Service Center, January 13, 1959], letter, January 13, 1959; (https://texashistory.unt.edu/ark:/67531/metapth1407919/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .