[Letter from Harris L. Kempner to Dr. Frank L. Boyden, December 7, 1955], letter, December 7, 1955; (https://texashistory.unt.edu/ark:/67531/metapth1413548/m1/1/: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .