Kempner, Isaac H. (Isaac Herbert), 1873-1967. [Letter from I. H. Kempner to Denny Kempner, June 11, 1956], letter, June 11, 1956; (https://texashistory.unt.edu/ark:/67531/metapth1508591/m1/1/: accessed June 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .