Geology of the forty-ninth parallel sheet no. 11, map 84 A
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Geology of the forty-ninth parallel sheet no. 11, map 84 A, map, 1913; [Ottawa, Ontario, Canada]. (texashistory.unt.edu/ark:/67531/metapth187405/: accessed July 22, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting University of Texas at Arlington Library.