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Level III Ecoregions of Montana

Revised April 2000
National Health and Environmental Effects Research Laboratory
U.S. Environmental Protection Agency

level III ecoregions of Montana region 15   15. Northern Rockies
region 16   16. Montana Valley and Foothill Prairies
region 17   17. Middle Rockies
region 18   18. Wyoming Basin
region 41   41. Canadian Rockies
region 42   42. Northwestern Glaciated Plains
region 43   43. Northwestern Great Plains