Methods (Steel) of Supporting Cables, Fixtures, Panels Appliances, Etc for Steel & Aluminum Dk.s & Bulkheads - 38 of 39, technical drawing, July 15, 1939; (https://texashistory.unt.edu/ark:/67531/metapth887462/m1/1/: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .