Subject
Gold mines and mining
13
Cripple Creek (Colo.) History
8
Geology
3
Mines and mineral resources
3
Railroads
2
Coal
1
Colorado Springs (Colo.) Description and travel
1
Cripple Creek (Colo.)
1
Cripple Creek (Colo.) Description and travel
1
Cripple Creek Strike, Cripple Creek, Colo., 1903-1904
1
Flood control
1
Flood damage prevention
1
Floodplain management
1
Fluorspar
1
Gold Assaying
1
Gold miners History
1
Gold mines and mining Finance
1
Gold mines and mining History
1
Labor disputes
1
Limestone
1
Miners Labor unions
1
Miners Labor unions History
1
Mines and mineral resources History
1
Petroleum
1
Prostitution History
1
Tellurides
1
Water-supply
1