[Letter from Isaac H. Kempner to David F. Weston, September 25, 1963], letter, September 25, 1963; (https://texashistory.unt.edu/ark:/67531/metapth1513679/m1/1/: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .