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Topical Subjects
- Coal Mines and Mining--Mine Interiors--Machinery.[remove]122
- Coal mines and mining.62
- Coal-mining machinery.50
- Coal mines and mining--West Virginia--Thomas.27
- Conveying machinery.26
- Coal miners.25
- Shuttle cars (Mine haulage)10
- Coal-handling machinery.8
- Coal Mines and Mining--Machinery.7
- Coal mines and mining--Equipment and supplies.7
- Mine timbering.7
- Coal mines and mining--Illinois--Elkville.5
- Coal-carrying vessels.5
- Mine railroads--Cars.3
- Mine roof bolting.3
- Mining machinery.3
- Blades.2
- Coal--Transportation.2
- Gas-turbines.2
- Longwall mining.2