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Start Over You searched for: Subject Environment Remove constraint Subject: Environment Subject Biotic communities Remove constraint Subject: Biotic communities Place Massachusetts Remove constraint Place: Massachusetts Place Colorado Remove constraint Place: Colorado Place Arizona Remove constraint Place: Arizona Place Florida Remove constraint Place: Florida Data type Polygon Remove constraint Data type: Polygon Year 2003 Remove constraint Year: 2003

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1. Omernik's Level III Ecoregions of the Continental United States, 2003 Polygon Stanford University Public content

2003. United States. Environmental Protection Agency. This polygon shapefile shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of... National Atlas of the United States.