Improvement in Electro-Magnetic Engines., patent, April 9, 1872; (https://texashistory.unt.edu/ark:/67531/metapth165332/m1/1/: accessed June 8, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Improvement in Electro-Magnetic Engines., patent, April 9, 1872; (https://texashistory.unt.edu/ark:/67531/metapth165332/m1/1/: accessed June 8, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .