Plowshare., patent, November 3, 1908; (https://texashistory.unt.edu/ark:/67531/metapth514700/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Plowshare., patent, November 3, 1908; (https://texashistory.unt.edu/ark:/67531/metapth514700/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .