Harrow-Cultivator Attachment, patent, July 30, 1912; (https://texashistory.unt.edu/ark:/67531/metapth509497/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Harrow-Cultivator Attachment, patent, July 30, 1912; (https://texashistory.unt.edu/ark:/67531/metapth509497/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .