[Letter from I. H. Kempner to I. H. Kempner, Jr., September 16, 1952], letter, September 16, 1952; (https://texashistory.unt.edu/ark:/67531/metapth1053990/m1/1/: accessed June 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .