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Spatial Coverage
- Colorado2
- Alaska1
- Arizona1
- British Columbia1
- Central City1
- Central City (Colo.)1
- Central City.1
- Chibougamau Lake Region1
- Chibougamau Lake Region.1
- Clear Creek County1
- Clear Creek County (Colo.)1
- Clear Creek County.1
- Cochise County1
- Cochise County (Ariz.)1
- Cochise County.1
- Coeur d'Alene Mining District (Idaho)1
- Coeur d'Alene Mining District.1
- Esmeralda County1
- Goldfield Mining District (Nev.)1
- Idaho1
