Kempner, Daniel W. (Daniel Webster), 1877-1956. [Letter from D. W. Kempner to Mary Jean, May 19, 1956], letter, May 19, 1956; (https://texashistory.unt.edu/ark:/67531/metapth1031327/m1/1/: accessed January 26, 2020), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .