Airship, patent, November 10, 1914; (https://texashistory.unt.edu/ark:/67531/metapth859440/m1/1/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Airship, patent, November 10, 1914; (https://texashistory.unt.edu/ark:/67531/metapth859440/m1/1/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .