Geology of the forty-ninth parallel sheet no. 12, map 85 A, map, 1913; (https://texashistory.unt.edu/ark:/67531/metapth187406/m1/1/: accessed June 11, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Geology of the forty-ninth parallel sheet no. 12, map 85 A, map, 1913; (https://texashistory.unt.edu/ark:/67531/metapth187406/m1/1/: accessed June 11, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .