Level IV Ecoregions of Oklahoma extracted from a nationwide ecoregions layer. Date created by the US Environmental Protection Agency. Map Services created by the Oklahoma Biological Survey for educational purposes.
Level IV Ecoregions of Oklahoma extracted from a nationwide ecoregions layer. Date created by the US Environmental Protection Agency. Map Services created by the Oklahoma Biological Survey for educational purposes.

For full metadata on the original data source, see ftp://ftp.epa.gov/wed/ecoregions/ok/ok_eco_l4.htm
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