Hawk, Darall G. [Letter from Darall G. Hawk to Jack Sayles, July 6, 1940], letter, July 6, 1940; (https://texashistory.unt.edu/ark:/67531/metapth1156291/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .