[Letter from I. H. Kempner to H. Roy Cullen, December 3, 1954], letter, December 3, 1954; (https://texashistory.unt.edu/ark:/67531/metapth1502161/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .