Kauffman, J. L. [Letter from J. L. Kauffman to Daniel and Jeane Kempner, May 28, 1952], letter, May 28, 1952; (https://texashistory.unt.edu/ark:/67531/metapth1342077/m1/1/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .