Double-Mold-Board Plow, patent, December 24, 1889; (https://texashistory.unt.edu/ark:/67531/metapth172240/m1/1/: accessed June 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Double-Mold-Board Plow, patent, December 24, 1889; (https://texashistory.unt.edu/ark:/67531/metapth172240/m1/1/: accessed June 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .