Aircraft, patent, April 5, 1921; (https://texashistory.unt.edu/ark:/67531/metapth1258970/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Aircraft, patent, April 5, 1921; (https://texashistory.unt.edu/ark:/67531/metapth1258970/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .