Thompson, Edward Randall, Jr. [Letter from Edward R. Thompson Jr. to Harris L. Kempner, July 6, 1964], letter, July 6, 1964; (https://texashistory.unt.edu/ark:/67531/metapth1197375/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .