Tombstone-Mold, patent, September 2, 1913; (https://texashistory.unt.edu/ark:/67531/metapth853476/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Tombstone-Mold, patent, September 2, 1913; (https://texashistory.unt.edu/ark:/67531/metapth853476/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .