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Topical Subjects
- Coal mines and mining.[remove]38
- Coal miners.18
- Coal Mines and Mining--Mine Interiors.17
- Coal Mines and Mining--Miners at Work.15
- Coal-mining machinery.7
- Mine railroads.7
- Coal Mines and Mining--Mine Facilities.4
- Electricity in mining.4
- Boring.2
- Conveying machinery.2
- Loaders (Machines)2
- Mine gases--Measurement.2
- Mine roof bolting.2
- Shuttle cars (Mine haulage)2
- Coal Mines and Mining--Mine Interiors--Machinery.1
- Coal Mines and Mining--Miners and Miners' Families' Daily Lives.1
- Coal-mining machinery--Maintenance and repair.1
- Electric transformers.1
- Elevators.1
- Mine ventilation.1