Topical Subjects
- Freight cars.28
- Coal Mines and Mining--Mine Interiors--Machinery.26
- Conveying machinery.26
- Shuttle cars (Mine haulage)24
- Coal Mines and Mining--Mine Facilities.23
- Coal Mines and Mining--Tipples.22
- Industrial equipment.22
- Mine railroads.21
- Coal Mines and Mining--Coal Carts.19
- Coal.19
- Coal Mines and Mining--Coal Transportation--Facilities.17
- Coal--Transportation--West Virginia.17
- Coal Mines and Mining--Coal Transportation--River.15
- Coal Mines and Mining--Surface Mining.15
- Coal trade.15
- Mining machinery.15
- Coal mines and mining--Safety measures.14
- Loaders (Machines)13
- Coal Mines and Mining--Mine Entrances.12
- Mine roof bolting.12