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Topical Subjects
- Coal miners.[remove]198
- Coal mines and mining.[remove]198
- Coal Mines and Mining--Miners at Work.86
- Coal-mining machinery.53
- Coal Mines and Mining--Mine Interiors--Machinery.22
- Coal Mines and Mining--Pocahontas Operators Association.22
- Coal Mines and Mining--Consolidation Coal Company.19
- Mine railroads.16
- Shuttle cars (Mine haulage)15
- Loaders (Machines)12
- Coal Mines and Mining.11
- Coal Mines and Mining--Mine Interiors.9
- Boring.8
- Mine roof bolting.8
- Coal--Transportation.6
- Mine gases--Measurement.6
- Mine timbering.6
- Mining machinery.6
- Coal Mines and Mining--Portraits--Group.5
- Mine railroads--Cars.5