Pennington, E. J. [Letter from E. J. Pennington to I. H. Kempner, May 6, 1953], letter, May 6, 1953; (https://texashistory.unt.edu/ark:/67531/metapth1463169/m1/2/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .