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1. Bailey's Ecoregions and Subregions of the United States, 2004 Polygon Stanford University Public content

2004. United States. Forest Service. This polygon shapefile is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.... National Atlas of the United States.

2. 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.