Geologic Atlas of the United States: Van Horn Folio, Texas, book, 1914; (https://texashistory.unt.edu/ark:/67531/metapth60972/m1/1/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Geologic Atlas of the United States: Van Horn Folio, Texas, book, 1914; (https://texashistory.unt.edu/ark:/67531/metapth60972/m1/1/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .