Purifying Oils, patent, August 27, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1257804/m1/3/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Purifying Oils, patent, August 27, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1257804/m1/3/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .