Exhibit N. Vertical and Horizontal Cross Sections GH and OP
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Exhibit N. Vertical and Horizontal Cross Sections GH and OP, map, November 1909; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metapth1136076/: accessed May 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.