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Topical Subjects
- Coal miners.[remove]53
- Coal mines and mining.[remove]53
- Coal-mining machinery.[remove]53
- Coal Mines and Mining--Miners at Work.26
- Coal Mines and Mining--Mine Interiors--Machinery.10
- Coal Mines and Mining--Pocahontas Operators Association.7
- Coal Mines and Mining--Consolidation Coal Company.5
- Coal Mines and Mining--Mine Interiors.4
- Loaders (Machines)4
- Boring.1
- Coal Mines and Mining--Price Hill Colliery.1
- Electricity in mining.1
- Mine roof bolting.1