Blackshear, A. H., Jr. [Letter from A. H. Blackshear, Jr. to Dr. Marceli Dobrzynski, November 15, 1955], letter, November 15, 1955; (https://texashistory.unt.edu/ark:/67531/metapth1503131/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .