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Topical Subjects
- Coal mines and mining.[remove]217
- Coal miners.73
- Power shovels.61
- Coal Mines and Mining--Miners at Work.60
- Coal Mines and Mining--Portraits--Group.54
- Strip mining.43
- Coal-mining machinery.39
- Coal Mines and Mining--Mine Interiors.27
- Coal Mines and Mining--Consolidation Coal Company.26
- Coal Mines and Mining--Mine Interiors--Machinery.21
- Shuttle cars (Mine haulage)19
- Mine railroads.11
- Coal Mines and Mining--Mine Facilities.10
- Loaders (Machines)8
- Mine gases--Measurement.8
- Tipples.8
- Coal Mines and Mining--Tipples.7
- Coal Mines and Mining--Mine Entrances.6
- Coal--Transportation.6
- Boring.5