Pencil Holder, patent, August 30, 1904; (https://texashistory.unt.edu/ark:/67531/metapth508564/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Pencil Holder, patent, August 30, 1904; (https://texashistory.unt.edu/ark:/67531/metapth508564/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .