Thornton, E. H., Jr. [Letter from E. H. Thornton, Jr. to D. W. Kempner, November 20, 1951], letter, November 20, 1951; (https://texashistory.unt.edu/ark:/67531/metapth1013650/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .