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You searched for: Author United States. Environmental Protection Agency Remove constraint Author: United States. Environmental Protection Agency Publisher National Atlas of the United States Remove constraint Publisher: National Atlas of the United States Institution Stanford Remove constraint Institution: Stanford Place Arizona Remove constraint Place: Arizona 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

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.