Earth-Auger., patent, March 29, 1892; (https://texashistory.unt.edu/ark:/67531/metapth172986/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Earth-Auger., patent, March 29, 1892; (https://texashistory.unt.edu/ark:/67531/metapth172986/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .