Tillage Implement., patent, December 4, 1917; (https://texashistory.unt.edu/ark:/67531/metapth1256958/m1/3/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Tillage Implement., patent, December 4, 1917; (https://texashistory.unt.edu/ark:/67531/metapth1256958/m1/3/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .