Lawson, William D.; Wood, Timothy A.; Newhouse, Charles D. & Jayawickrama, Priyantha W. Evaluating existing culverts for load capacity allowing for soil structure interaction, report, December 2010; (https://texashistory.unt.edu/ark:/67531/metapth326775/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .