[Letter from Harris L. Kempner to Howard G. Swann, January 30, 1964], letter, January 30, 1964; (https://texashistory.unt.edu/ark:/67531/metapth1420968/m1/3/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .