Geology of the forty-ninth parallel sheet no. 10, map 83 A. Side: 1 of 2
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Geology of the forty-ninth parallel sheet no. 10, map 83 A., map, 1913; [Ottawa, Ontario, Canada]. (https://texashistory.unt.edu/ark:/67531/metapth187404/m1/1/: accessed June 12, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting University of Texas at Arlington Library.