Hardy, G. W. & Bowen, R. D. [Letter from G. W. Hardy and R. D. Bowen, September 28, 1921], letter, September 28, 1921; (https://texashistory.unt.edu/ark:/67531/metapth1091319/m1/1/: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .