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1. Ecoregions of Pennsylvania Level III
2010. U.S. Environmental Protection Agency. Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the typ...
2. Ecoregions of Pennsylvania Level IV
2010. U.S. Environmental Protection Agency. Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the typ...