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Topical Subjects
- Coal mines and mining--Kentucky--Jenkins.1
- Coal mines and mining--Safety measures.1
- Coal mines and mining--West Virginia--Owings.1
- Coal mines and mining--West Virginia--Pursglove.1
- Coal mines and mining--West Virginia--Watson.1
- Coal-handling machinery.1
- Electricity in mining.1
- Machine shops.1
- Mine railroads--Cars.1
- Roof trusses.1