Kempner, Isaac H. (Isaac Herbert), 1873-1967. [Letter from Isaac H. Kempner to Hetta Jockusch, January 16, 1964], letter, January 16, 1964; (https://texashistory.unt.edu/ark:/67531/metapth1513426/m1/1/: accessed July 3, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .