Shell Mountains Quadrangle, map, 1953; (https://texashistory.unt.edu/ark:/67531/metapth453684/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Shell Mountains Quadrangle, map, 1953; (https://texashistory.unt.edu/ark:/67531/metapth453684/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .