Stirl, Gus A. [Letter from Gus A. Stirl to Isaac Herbert Kempner, November 16, 1960], letter, November 16, 1960; (https://texashistory.unt.edu/ark:/67531/metapth1197593/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .