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Topical Subjects
- Coal Mines and Mining--Preparation Plant Interiors.[remove]52
- Coal preparation.42
- Conveying machinery.15
- Coal preparation plants.10
- Coal washing.7
- Loading and unloading.2
- Coal preparation plants--West Virginia--Itmann.1
- Coal--Transportation.1
- Freight cars.1
- Pumping machinery.1
- Tipples.1
- Vibrating conveyors.1
- Welding.1