Read more about Missouri's terrestrial ecoregions. The reference map and textured map will show Level I ecoregions in a tooltip box. Refer to the county map for county names.
- (EPA). 2003. <http://www.epa.gov/> Accessed 1 February 2007.
- . 2001. State and County Boundaries of the United States. <http://nationalatlas.gov/atlasftp.html> Accessed 1 December 2009.