Geology of the forty-ninth parallel sheet no. 15, map 88 A.
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Geology of the forty-ninth parallel sheet no. 15, map 88 A., map, 1913; [Ottawa, Ontario, Canada]. (texashistory.unt.edu/ark:/67531/metapth187409/: accessed April 25, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting University of Texas at Arlington Library.