Hollister, Clay H. [Letter from Clay H. Hollister to Mr. and Mrs. Harris L. Kempner, May 4, 1956], letter, May 4, 1956; (https://texashistory.unt.edu/ark:/67531/metapth1419067/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .