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Topical Subjects
- Coal Mines and Mining--Miners at Work.[remove]146
- Coal miners.106
- Coal mines and mining.96
- Coal-mining machinery.37
- Mine railroads.13
- Loaders (Machines)12
- Mine gases--Measurement.8
- Shuttle cars (Mine haulage)8
- Mine roof bolting.7
- Coal mines and mining--Explosives.6
- Coal mines and mining--West Virginia.6
- Boring.5
- Electric locomotives.5
- Horses.5
- Coal miners--West Virginia.4
- Coal mines and mining--Safety measures.4
- Working dogs.4
- Coal miners--Ohio--Zanesville.3
- Coal mines and mining--Kentucky.3
- Coal mines and mining--Ohio--Zanesville.3