Caisson, patent, December 19, 1905; (https://texashistory.unt.edu/ark:/67531/metapth514788/m1/1/: accessed April 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Caisson, patent, December 19, 1905; (https://texashistory.unt.edu/ark:/67531/metapth514788/m1/1/: accessed April 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .