Couden, R. E. [Letter from R. E. Couden to Isaac H. Kempner, June 24, 1958], letter, June 24, 1958; (https://texashistory.unt.edu/ark:/67531/metapth1514217/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .