Process of and Apparatus for Hydrogenating Fats, Oils, Waxes, and the Like., patent, August 20, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1259266/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .