Sadler, Harley. [Letter from Harley Sadler to T. N. Carswell - February 28, 1941], letter, February 28, 1941; (https://texashistory.unt.edu/ark:/67531/metapth1397712/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .