Post-Protector, patent, April 21, 1903; (https://texashistory.unt.edu/ark:/67531/metapth514882/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Post-Protector, patent, April 21, 1903; (https://texashistory.unt.edu/ark:/67531/metapth514882/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .