[Letter from Edwin P. Neilan to I. H. Kempner, August 21, 1963], letter, August 21, 1963; (https://texashistory.unt.edu/ark:/67531/metapth1509141/m1/1/: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .