Topical Subjects
- Coal mines and mining--Safety measures.1
- Coal mines and mining--West Virginia--Logan County.1
- Coal mines and mining.[remove]814
- Coal preparation plants.12
- Coal trade.4
- Coal--Geology.5
- Coal--Transportation.66
- Coal-handling machinery.5
- Coal-mining machinery--Maintenance and repair.1
- Coal-mining machinery.87
- Coal.5
- Company stores.1
- Conveying machinery.63
- Core drilling.1
- Cranes, derricks, etc.1
- Dams.1
- Deforestation.3
- Donkeys.1
- Electric locomotives.5
- Electric motors.1