Ashtola Quadrangle, map, 1983; (https://texashistory.unt.edu/ark:/67531/metapth109100/m1/1/: accessed April 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Ashtola Quadrangle, map, 1983; (https://texashistory.unt.edu/ark:/67531/metapth109100/m1/1/: accessed April 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .