Combined Grubbing, Subsoiling, and Turning Plow, patent, May 23, 1905; (https://texashistory.unt.edu/ark:/67531/metapth509028/m1/1/: accessed July 10, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Combined Grubbing, Subsoiling, and Turning Plow, patent, May 23, 1905; (https://texashistory.unt.edu/ark:/67531/metapth509028/m1/1/: accessed July 10, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .