[Letter from I. H. Kempner to Donald Maclean, December 18, 1953], letter, December 18, 1953; (https://texashistory.unt.edu/ark:/67531/metapth1471667/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .