Armstrong, Oscar. [Letter from Oscar Armstrong to I. H. Kempner, June 28, 1952], letter, June 28, 1952; (https://texashistory.unt.edu/ark:/67531/metapth1456969/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .