EarthWorks Geospatial Catalog

The geographic face of the nation - elevation [cartographic material] / U.S. Department of the Interior, U.S. Geological Survey.

Relief shown by shading. "The U.S. Geological Survey (USGS) has completed a seamless elevation dataset for the entire United States. The National Elevation Dataset (NED) was produced from over 57,000 individual digital elevation models."
U.S. Geological Survey ;
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