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2014. Geological Survey (U.S.). This line shapefile shows elevation contour lines for the conterminous United States. The map layer was derived from the 100-meter resolution eleva... National Atlas of the United States.
1842, 1843, and 1844. Rumsey, David, 1944- and Southern Pacific Company. The large map of the west is one of the most interesting and beautiful government maps of the 1840's. It filled in many of the gaps in cartographic... Cartography Associates.