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Subject
- Coal mines and mining.[remove]4
- Coal miners.3
- Labor.2
- Mines and mineral resources.2
- Strikes and lockouts.2
- Coal mine accidents.1
- Disasters.1
- Fuel.1
- Illinois. Department of Public Welfare.1
- Industry--United States--History.1
- Mine buildings.1
- Miners.1
- Psychiatric hospitals.1
- Strikes and lockouts--Coal miners--Illinois.1
- Tree felling.1