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Start Over You searched for: Publisher National Atlas of the United States Remove constraint Publisher: National Atlas of the United States Access Public Remove constraint Access: Public Subject Ecological regions Remove constraint Subject: Ecological regions Place Massachusetts Remove constraint Place: Massachusetts Place Alabama Remove constraint Place: Alabama Place Connecticut Remove constraint Place: Connecticut Place Arkansas Remove constraint Place: Arkansas Data type Polygon Remove constraint Data type: Polygon

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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.