Kempner, Harris Leon. [Letter From Harris Leon Kempner to Robert Burton, March 16, 1965], letter, March 16, 1965; (https://texashistory.unt.edu/ark:/67531/metapth1425461/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .