Improvement in Earth-Augurs., patent, November 20, 1877; (https://texashistory.unt.edu/ark:/67531/metapth166720/m1/1/: accessed July 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Improvement in Earth-Augurs., patent, November 20, 1877; (https://texashistory.unt.edu/ark:/67531/metapth166720/m1/1/: accessed July 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .