Cotton-Chopper., patent, August 2, 1910; (https://texashistory.unt.edu/ark:/67531/metapth511667/m1/1/: accessed April 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Cotton-Chopper., patent, August 2, 1910; (https://texashistory.unt.edu/ark:/67531/metapth511667/m1/1/: accessed April 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .