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Subject (Region)
- United States18
- Colorado7
- Gold King Mine (San Juan County, Colo.)7
- Animas River Watershed (Colo. and N.M.)4
- California4
- Navajo Nation, Arizona, New Mexico & Utah4
- New Jersey4
- Southern Ute Indian Tribe of the Southern Ute Reservation, Colorado4
- Blackfoot River3
- Mike Horse Mine3
- Mike Horse Mine (Mont.)3
- Mike Horse Mine Region3
- Montana3
- Pinewood Region3
- South Carolina3
- Arkansas River2
- Leadville2
- Ute Mountain Tribe of the Ute Mountain Reservation, Colorado, New Mexico & Utah2
- Canada1
- Champlain, Lake1