Moldboard, patent, April 8, 1913; (https://texashistory.unt.edu/ark:/67531/metapth854081/m1/1/: accessed June 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Moldboard, patent, April 8, 1913; (https://texashistory.unt.edu/ark:/67531/metapth854081/m1/1/: accessed June 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .