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Topical Subjects
- Mine roof bolting.[remove]16
- Coal miners.11
- Coal mines and mining.9
- Coal Mines and Mining--Miners at Work.7
- Coal Mines and Mining--Consolidation Coal Company.3
- Coal Mines and Mining--Mine Interiors--Machinery.3
- Coal Mines and Mining--Mine Interiors.2
- Coal mines and mining--Equipment and supplies.2
- Coal-mining machinery.2
- Coal Mines and Mining--Coal Displays.1
- Coal mines and mining--Kentucky.1
- Coal mines and mining--West Virginia--Pursglove.1
- Mining machinery.1