Blackshear, A. H., Jr. [Letter from A. H. Blackshear, Jr. to A. J. Warren, November 17, 1956], letter, November 17, 1956; (https://texashistory.unt.edu/ark:/67531/metapth1420313/m1/2/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .