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- Railroads--Colorado--Maps12
- Mines and mineral resources--Colorado--Maps9
- Roads--Colorado--Maps8
- Coal--Colorado--Maps1
- Forest reserves--Colorado--Maps1
- Gold mines and mining--Colorado--Gilpin County--Maps1
- Gold mines and mining--Colorado--Maps1
- Nature photography1
- Roads--Colorado--Denver Region--Maps1
- Roads--United States--Maps1
- Roads--West (U.S.)--Maps1
- Silver mines and mining--Colorado--Maps1