Topical Subjects
- Conveying machinery.5
- Mine roof bolting.5
- Tiger (Power shovel)5
- Coal-handling machinery.4
- Electricity in mining.4
- Coal Mines and Mining.3
- Coal--Geology.3
- Coal.3
- Mine railroads--Cars.3
- Freight cars.2
- Machine shops.2
- Coal Mines and Mining--Company Stores and Offices.1
- Coal Mines and Mining--Miners and Miners' Families' Daily Lives.1
- Coal Mines and Mining--Surface Mining.1
- Coal preparation plants.1
- Coal trade.1
- Coal-mining machinery--Maintenance and repair.1
- Core drilling.1
- Dams.1
- Electric locomotives.1