Keyser, William B. [Letter from W. B. Keyser to D. W. Kempner, December 15, 1949], letter, December 15, 1949; (https://texashistory.unt.edu/ark:/67531/metapth1013140/m1/1/: accessed July 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .