2012. Geological Survey (U.S.). This layer is a georeferenced raster image displaying elevation data for the conterminous United States. These data were derived from the National ... National Atlas of the United States.
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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.