2007. East View Cartographic, Incorporated and East View Cartographic, Incorporated. LandScan 2007 Global Population Database is a raster theme representing population counts at 30 arc second resolution (1 km. or finer) as of 2007. East View Cartographic, Incorporated.
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2007. U.S. Geological Survey. United States Cities & Towns is a point theme representing population centers throughout the United States. Geological Survey.
2007. National Climatic Data Center (U.S.), United States. National Environmental Satellite, Data, and Information Service, United States. National Oceanic and Atmospheric Administration., and Digital Social Science Centaer, Columbia University Libraries. World Weather Stations is a point theme representing weather stations worldwide. Asheville, North Carloina.