Johnson, Rupert H. [Letter from R. H. Johnson to T. N. Carswell - May 12, 1938], letter, May 12, 1938; (https://texashistory.unt.edu/ark:/67531/metapth1398709/m1/1/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .