Blackshear, A. H., Jr. [Letter from A. H. Blackshear, Jr., January 11, 1957], letter, January 11, 1957; (https://texashistory.unt.edu/ark:/67531/metapth1491054/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .