Hollister, Clay H. [Letter from Clay H. Hollister to Harris Leon Kempner, July 21, 1959], letter, July 21, 1959; (https://texashistory.unt.edu/ark:/67531/metapth1420571/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .