Digital Maps and Geospatial Data | Princeton University
Ecoregions of the conterminous United States / by James M. Omernik (Map)
- Omernik, James M.
- [Corvallis, Or.] : Corvallis Environmental Research Laboratory, U.S. Environmental Protection Agency, 1986.
- Table includes notes on land-surface form, potential natural vegetation, land use, and soils. Accompanied by text: Map supplement, ecoregions of the conterminous United States.  pages.
- United States
- Ecology—United States—Maps, Ecological regions—United States—Maps, and Maps
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