Topical Subjects
- Coal mines and mining--West Virginia--Owings.1
- Coal mines and mining--West Virginia--Watson.1
- Coal mines and mining--West Virginia.2
- Coal mines and mining.73
- Coal--Geology.1
- Coal--Transportation.2
- Coal-mining machinery.41
- Coalbed methane--Testing.1
- Coke-ovens.1
- Conveying machinery.1
- Electric locomotives.1
- Electricity in mining.1
- Elevators.1
- Freight cars.1
- Horses.1
- Loaders (Machines)12
- Mine gases--Measurement.6
- Mine gases--Testing.1
- Mine railroad trains.1
- Mine railroads.5