Folding Wagon-Box Step, patent, January 25, 1898; (https://texashistory.unt.edu/ark:/67531/metapth512933/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Folding Wagon-Box Step, patent, January 25, 1898; (https://texashistory.unt.edu/ark:/67531/metapth512933/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .