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Topical Subjects
- Coal preparation.[remove]58
- Coal Mines and Mining--Preparation Plant Interiors.48
- Conveying machinery.18
- Coal washing.9
- Coal Mines and Mining--Price Hill Colliery.4
- Loading and unloading.3
- Coal Mines and Mining--Consolidation Coal Company.2
- Coal Mines and Mining--Pocahontas Operators Association.2
- Coal Mines and Mining--Preparation Plant Exteriors.2
- Coal miners.1
- Coal preparation plants.1
- Freight cars.1
- Sorting devices.1
- Tipples.1
- Vibrating conveyors.1
- Welding.1