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Topical Subjects
- Coal Mines and Mining--Mine Interiors.[remove]61
- Coal mines and mining.36
- Coal miners.15
- Coal-mining machinery.10
- Coal mines and mining--Equipment and supplies.7
- Mine railroads.7
- Coal mines and mining--Explosives.4
- Coal mines and mining--West Virginia--Thomas.4
- Elevators.4
- Electricity in mining.3
- Mine gases--Measurement.3
- Shuttle cars (Mine haulage)3
- Coal miners--West Virginia--Maidsville.2
- Coal mines and mining--Kentucky.2
- Coal mines and mining--West Virginia--Helen.2
- Coal mines and mining--West Virginia--Maidsville.2
- Coal--Geology.2
- Conveying machinery.2
- Mine railroads--Cars.2
- Mine roof bolting.2