Tractor, patent, July 1, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1257015/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Tractor, patent, July 1, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1257015/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .