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Topical Subjects
- Coal mines and mining.[remove]87
- Coal-mining machinery.[remove]87
- Coal miners.53
- Coal Mines and Mining--Mine Interiors--Machinery.29
- Coal Mines and Mining--Miners at Work.29
- Conveying machinery.8
- Coal Mines and Mining--Mine Interiors.7
- Coal Mines and Mining--Pocahontas Operators Association.7
- Coal Mines and Mining.7
- Coal Mines and Mining--Consolidation Coal Company.6
- Loaders (Machines)5
- Shuttle cars (Mine haulage)4
- Boring.1
- Coal Mines and Mining--Machinery.1
- Coal Mines and Mining--Price Hill Colliery.1
- Coal--Transportation.1
- Coal-handling machinery.1
- Electricity in mining.1
- Mine railroads--Cars.1
- Mine railroads.1