Cement., patent, March 23, 1909; (https://texashistory.unt.edu/ark:/67531/metapth512006/m1/1/: accessed May 14, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Cement., patent, March 23, 1909; (https://texashistory.unt.edu/ark:/67531/metapth512006/m1/1/: accessed May 14, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .