Cotton-Chopper., patent, April 24, 1917; (https://texashistory.unt.edu/ark:/67531/metapth857867/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Cotton-Chopper., patent, April 24, 1917; (https://texashistory.unt.edu/ark:/67531/metapth857867/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .