Geological Survey (U.S.). Parts of atlas sheets nos. 69(B), 69(D), 77(B) and 78(A), map, 1881; (https://texashistory.unt.edu/ark:/67531/metapth190732/m1/1/: accessed May 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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