Geology of the forty-ninth parallel sheet no. 12, map 85 A Side: 1 of 2
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Geology of the forty-ninth parallel sheet no. 12, map 85 A, map, 1913; [Ottawa, Ontario, Canada]. (https://texashistory.unt.edu/ark:/67531/metapth187406/m1/1/: accessed June 11, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting University of Texas at Arlington Library.