[Letter from Robert Lee Kempner to J. O. Gillham, May 19, 1953], letter, May 19, 1953; (https://texashistory.unt.edu/ark:/67531/metapth1463095/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .