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Subject (Region)
- United States54
- Gold King Mine (San Juan County, Colo.)7
- Colorado5
- Animas River Watershed (Colo. and N.M.)4
- Navajo Nation, Arizona, New Mexico & Utah4
- Southern Ute Indian Tribe of the Southern Ute Reservation, Colorado4
- Christian County2
- Delaware2
- Libby2
- Michigan2
- Missouri2
- Montana2
- Ute Mountain Tribe of the Ute Mountain Reservation, Colorado, New Mexico & Utah2
- Alabama1
- Anniston1
- Charleston1
- China1
- Navajo Indian Reservation1
- San Juan County1
- Texas1