Geology of the forty-ninth parallel sheet no. 4, map 77 A, map, 1913; (https://texashistory.unt.edu/ark:/67531/metapth187398/m1/1/: accessed April 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Geology of the forty-ninth parallel sheet no. 4, map 77 A, map, 1913; (https://texashistory.unt.edu/ark:/67531/metapth187398/m1/1/: accessed April 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .