Spatial Coverage
- Casey County (Ky.)1
- Chelan County (Wash.)1
- Chicago (Ill.)1
- Chickasaw Nation, Oklahoma1
- Clarion County1
- Coconino County (Ariz.)1
- Columbia River1
- Colville Indian Reservation (Wash.)1
- Connecticut1
- Connecticut River Valley1
- Connecticut River Valley.1
- Crete (Greece)1
- Culpeper County (Va.)1
- Cumberland Mountains1
- Custer County1
- Dakota du sud1
- Decatur County (Tenn.)1
- Delaware1
- Denver1
- Denver (Colo.)1
