You searched for: Author United States. Environmental Protection Agency Remove constraint Author: United States. Environmental Protection Agency Subject Environment Remove constraint Subject: Environment Institution Stanford Remove constraint Institution: Stanford Place Alaska Remove constraint Place: Alaska Place Arkansas Remove constraint Place: Arkansas Place Arizona Remove constraint Place: Arizona Bounding Box 50.273438 19.12441 59.589844 28.748397 Remove constraint Bounding Box: 50.273438 19.12441 59.589844 28.748397
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.