Gilbert, Carl J. [Letter from Carl J. Gilbert to Harris L. Kempner, February 9, 1968], letter, February 9, 1968; (https://texashistory.unt.edu/ark:/67531/metapth1439201/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .