Blackshear, A. H., Jr. [Letter from A. H. Blackshear, Jr., March 11, 1955], letter, March 11, 1955; (https://texashistory.unt.edu/ark:/67531/metapth1162076/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .