[Internal Correspondence from D. W. Kempner to I. H. and H. L. Kempner, July 7, 1953], letter, July 7, 1953; (https://texashistory.unt.edu/ark:/67531/metapth1467275/m1/1/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .