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. Oak Ridge National Laboratory. The LandScan 2001 global population data set is a worldwide population database compiled on a 30" X 30" latitude/longitude grid. Census counts (at ... Oak Ridge National Laboratory.
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.