[Letter from I. H. Kempner to Dan Oppenheimer, October 25, 1955], letter, October 25, 1955; (https://texashistory.unt.edu/ark:/67531/metapth1472294/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .