Improvement in Locomotive Earth-Excavators., patent, December 28, 1875; (https://texashistory.unt.edu/ark:/67531/metapth166510/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Improvement in Locomotive Earth-Excavators., patent, December 28, 1875; (https://texashistory.unt.edu/ark:/67531/metapth166510/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .