Railway Cattle-Guard, patent, January 4, 1921; (https://texashistory.unt.edu/ark:/67531/metapth1256454/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Railway Cattle-Guard, patent, January 4, 1921; (https://texashistory.unt.edu/ark:/67531/metapth1256454/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .