2002. Ritters, Kurt. This raster layer is a grid map of North America including the Caribbean and most of Mexico in GeoTIFF format. The map layer is an excerpt from a g... National Atlas of the United States.
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1813. Harvard Map Collection, Harvard Library, Lewis, Samuel, 1753 or 4-1822., Plowman, Thomas Lowry., Fairman, Gideon, 1774-1827., and Hooker, William, 1782-1856. This layer is a georeferenced raster image of the historic paper map entitled: A correct map of the United States with the West Indies : from the b... Harvard Map Collection, Harvard College Library.
2005. EROS Data Center. The grayscale North America shaded relief data were derived from the GTOPO30 elevation data. GTOPO30 is a global digital elevation model (DEM) with... National Atlas of the United States.




