2001. Oak Ridge National Laboratory, Marie L. Urban, Research Staff. LandScan Global Population Database for 2001. Population counds at 30 arc second resolution.
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2001. Department of Commerce, Census Bureau, Geography Division. U.S. 107th Congressional Districts represents political boundaries for the U.S. 107th Congressional Districts. Environmental Systems Research Institute, Inc. (ESRI).
2001. Esri. World Lakes represents the major lakes and inland seas of the world. Esri.
2001. Esri. World Rivers represents the major rivers within the world. Esri.
2001. ESRI. World Time Zones represents the time zones of the world. The time zones are best displayed with World Countries or World Administrative Units. ESRI.
2001. World Wildlife Fund. World Wildlife Fund Marine Ecoregions represents global marine ecoregions. Ecoregions are defined as relatively large areas of land or water in the... Esri.
2001. World Wildlife Fund. World Wildlife Fund Marine Ecoregions represents global marine ecoregions. Ecoregions are defined as relatively large areas of land or water in the... ESRI.
2001. World Wildlife Fund. World Wildlife Fund Terrestrial Ecoregions represents global terrestrial ecoregions. Ecoregions are defined as relatively large areas of land or wa... Esri.
2001. World Wildlife Fund. World Wildlife Fund Terrestrial Ecoregions represents global terrestrial ecoregions. Ecoregions are defined as relatively large areas of land or wa... ESRI.