Thompson, Edward Randall, Jr. [Letter from Edward R. Thompson, Jr. to Harris Leon Kempner, June 26, 1964], letter, June 26, 1964; (https://texashistory.unt.edu/ark:/67531/metapth1477029/m1/1/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .