Kempner, Isaac H. [Letter from I. H. Kempner to Hyman Kempner, February 16, 1949], letter, February 16, 1949; (https://texashistory.unt.edu/ark:/67531/metapth1476707/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .