Kempner, Isaac H. (Isaac Herbert), 1873-1967. [Letter from I. H. Kempner to I. H. Kempner III, July 21, 1965], letter, July 21, 1965; (https://texashistory.unt.edu/ark:/67531/metapth1198157/m1/1/: accessed June 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .