Guth, Lee. [Letter from Lee Guth to D. W. Kempner, June 25, 1953], letter, June 25, 1953; (https://texashistory.unt.edu/ark:/67531/metapth1368849/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .