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Topical Subjects
- Coal miners.[remove]118
- Coal mines and mining.73
- Coal Mines and Mining--Miners at Work.63
- Coal-mining machinery.41
- Coal Mines and Mining--Consolidation Coal Company.37
- Coal mines and mining--Equipment and supplies.13
- Loaders (Machines)12
- Shuttle cars (Mine haulage)12
- Mine roof bolting.8
- Coal Mines and Mining--Mine Interiors.6
- Coal mines and mining--Explosives.6
- Mine gases--Measurement.6
- Boring.5
- Mine railroads.5
- Coal mines and mining--Safety measures.4
- Coal Mines and Mining--Miners and Miners' Families' Daily Lives.3
- Coal Mines and Mining--Mine Facilities.2
- Coal Mines and Mining--Mine Interiors--Machinery.2
- Coal mines and mining--West Virginia.2
- Coal--Transportation.2