Blackshear, A. H., Jr. [Letter from A. H. Blackshear, Jr. to Sugarland Industries, September 23, 1953], letter, September 23, 1953; (https://texashistory.unt.edu/ark:/67531/metapth1059131/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .