Level III and IV Ecoregions of the Continental United States. United States Environmental Protection Agency November, 2015.
Level III and IV Ecoregions of the Continental United States [link]Paper  abstract   bibtex   
Information and downloadable maps and datasets for Level III and IV ecoregions of the continental United States. Ecoregions are areas of general similarity in the type, quality, and quantity of environmental resources.
@misc{united_states_environmental_protection_agency_level_2015,
	type = {Data and {Tools}},
	title = {Level {III} and {IV} {Ecoregions} of the {Continental} {United} {States}},
	url = {https://www.epa.gov/eco-research/level-iii-and-iv-ecoregions-continental-united-states},
	abstract = {Information and downloadable maps and datasets for Level III and IV ecoregions of the continental United States.  Ecoregions are areas of general similarity in the type, quality, and quantity of environmental resources.},
	language = {en},
	urldate = {2023-06-29},
	author = {{United States Environmental Protection Agency}},
	month = nov,
	year = {2015},
	keywords = {Terrestrial Ecoregions (CEC 1997)},
}

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