Kempner, Isaac H. (Isaac Herbert), 1873-1967. [Letter from I. H. Kempner to Henry W. Haynes, March 10, 1952], letter, March 10, 1952; (https://texashistory.unt.edu/ark:/67531/metapth1456474/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .