Kempner, Isaac H. (Isaac Herbert), 1873-1967. [Letter from Isaac H. Kempner to Charles W. Hall, July 5, 1949], letter, July 5, 1949; (https://texashistory.unt.edu/ark:/67531/metapth1476461/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .