You searched for: Access Public Remove constraint Access: Public Subject Environment Remove constraint Subject: Environment Place Massachusetts Remove constraint Place: Massachusetts Place Delaware Remove constraint Place: Delaware Place New Hampshire Remove constraint Place: New Hampshire Place Hawaii Remove constraint Place: Hawaii Data type Polygon Remove constraint Data type: Polygon Year 2003 Remove constraint Year: 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.