Design for Railroad Spike., patent, September 7, 1897; (https://texashistory.unt.edu/ark:/67531/metapth511703/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Design for Railroad Spike., patent, September 7, 1897; (https://texashistory.unt.edu/ark:/67531/metapth511703/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .