Improvement in Ditching-Machines., patent, January 1, 1878; (https://texashistory.unt.edu/ark:/67531/metapth166739/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Improvement in Ditching-Machines., patent, January 1, 1878; (https://texashistory.unt.edu/ark:/67531/metapth166739/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .