Cotton-Bur Separator., patent, August 20, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1259536/m1/2/: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Cotton-Bur Separator., patent, August 20, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1259536/m1/2/: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .