Tillage Implement., patent, December 4, 1917; (https://texashistory.unt.edu/ark:/67531/metapth1256958/m1/2/: accessed July 15, 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/m1/2/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .