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Gannett, Henry, 1846-1914. Map of the United States showing the progress of the topographic survey during the fiscal year 1891-1892. [JPEG2000]. U.S. Geological Survey (Washington, D.C.), [1893?]. Retrieved from https://geo.nyu.edu/catalog/a7c4ce20-994e-0134-2096-0050569601ca-a