Areal Geology: Van Horn Quadrangle, map, January 1914; (https://texashistory.unt.edu/ark:/67531/metadc11823/m1/1/: accessed April 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Areal Geology: Van Horn Quadrangle, map, January 1914; (https://texashistory.unt.edu/ark:/67531/metadc11823/m1/1/: accessed April 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .