[Letter from D. W. Kempner to Mrs. D. W. Kempner, July 30, 1954], letter, July 30, 1954; (https://texashistory.unt.edu/ark:/67531/metapth1344110/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .