Geologic Atlas of the United States: Uvalde Folio, Texas, book, 1900; (https://texashistory.unt.edu/ark:/67531/metapth60971/m1/1/: accessed July 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Geologic Atlas of the United States: Uvalde Folio, Texas, book, 1900; (https://texashistory.unt.edu/ark:/67531/metapth60971/m1/1/: accessed July 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .