Heuco Mountains Quadrangle, map, 1958; (https://texashistory.unt.edu/ark:/67531/metapth454572/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Heuco Mountains Quadrangle, map, 1958; (https://texashistory.unt.edu/ark:/67531/metapth454572/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .