is a derivative work of the following images: File:Level III ecoregions, United States.png licensed with PD-USGov-EPA 2008-06-19T07:58:54Z Northwest-historian...
|Description=Map of the EPA ecoregions in the Upper Midwest of the United States |Source={{Derived from|Level III ecoregions, United States.png|display=50}} |Date=2019-01-10...
III ecoregions, United States, Arkansas.png AZ NM ecoregions.png Texas ecoregions.png Level III ecoregions, United States - Oklahoma.png Upper Midwest ecoregions...
