2003. EROS Data Center, Geological Survey (U.S), American Geological Institute, and Environmental Systems Research Institute (Redlands, Calif.). This datalayer is a polygon coverage representing hydrologic drainage basins located worldwide. The data displayed here is derived from the HYDRO 1... American Geological Institute.
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2002. EROS Data Center. The grayscale Alaska shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of Alaska at a resolution of ... National Atlas of the United States.