Kempner, Isaac H. (Isaac Herbert), 1873-1967. [Letter from Isaac H. Kempner to Cecile B. Kempner, February 12, 1960], letter, February 12, 1960; (https://texashistory.unt.edu/ark:/67531/metapth1322083/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .