[Letter from Yvonne Hanna to Harris L. Kempner, October 21, 1965], letter, October 21, 1965; (https://texashistory.unt.edu/ark:/67531/metapth1436772/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .