Blue Hole Springs Quadrangle, map, 1991; (https://texashistory.unt.edu/ark:/67531/metapth108963/m1/1/: accessed April 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Blue Hole Springs Quadrangle, map, 1991; (https://texashistory.unt.edu/ark:/67531/metapth108963/m1/1/: accessed April 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .