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Environmental Systems Research Institute, Inc. (ESRI)
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1. World Administrative Units, 2002
2002. Environmental Systems Research Institute, Inc. (ESRI). World Administrative Units 2002 is a polygon theme representing the boundaries for the first-level administrative units of the world, as they exist... Environmental Systems Research Institute, Inc. (ESRI).
2. World Wildlife Fund Ecoregions, 2000
1999. World Wildlife Fund and Environmental Systems Research Institute, Inc. (ESRI). World Wildlife Fund Ecoregions represents global terrestrial and freshwater ecoregions defined as relatively large areas of land or water in the wo... Environmental Systems Research Institute, Inc. (ESRI).