[Letter from Daniel W. Kempner to Mark. F. Heller, November 22, 1941], letter, November 22, 1941; (https://texashistory.unt.edu/ark:/67531/metapth1452247/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .