Kempner, Harris Leon. [Letter from Harris Leon Kempner to Isaac Herbert Kempner III, March 6, 1964], letter, March 6, 1964; (https://texashistory.unt.edu/ark:/67531/metapth1496522/m1/1/: accessed June 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .