Kempner, Harris Leon. [Letter from Harris L. Kempner to the Hotel Madison, September 26, 1964], letter, September 26, 1964; (https://texashistory.unt.edu/ark:/67531/metapth1425323/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .