Cotton-Chopper., patent, January 9, 1912; (https://texashistory.unt.edu/ark:/67531/metapth515043/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Cotton-Chopper., patent, January 9, 1912; (https://texashistory.unt.edu/ark:/67531/metapth515043/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .