Kempner, Harris Leon. [Letter from Harris L. Kempner to Mr. Clay H. Hollister, May 4, 1955], letter, May 4, 1955; (https://texashistory.unt.edu/ark:/67531/metapth1413675/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .