Kempner, Harris Leon. [Letter from Harris Leon Kempner to Lucius Thompson-McCausland, July 1, 1960], letter, July 1, 1960; (https://texashistory.unt.edu/ark:/67531/metapth1420647/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .