Blackshear, A. H., Jr. [Letter from A. H. Blackshear, Jr. to Group Hospital Service, November 7, 1955], letter, November 7, 1955; (https://texashistory.unt.edu/ark:/67531/metapth1345319/m1/2/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .