2001. National Atlas of the United States. The Bathymetric Shaded Relief of North America map layer shows depth ranges using colors, with relief enhanced by shading. The image was derived fr... National Atlas of the United States.
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2001. National Atlas of the United States. The Bathymetry of North America map layer shows depth ranges using colors. The image was derived from the National Geophysical Data Center's ETOPO2... National Atlas of the United States.
2001. East View Cartographic, Incorporated and East View Cartographic, Incorporated. LandScan 2001 Global Population Database is a raster theme representing population counts at 30 arc second resolution (1 km. or finer) as of 2001. East View Cartographic, Incorporated.
2001. Oak Ridge National Laboratory, Marie L. Urban, Research Staff. LandScan Global Population Database for 2001. Population counds at 30 arc second resolution.
2001. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 2001. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.