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Topical Subjects
- Power shovels.[remove]79
- Coal mines and mining.61
- Strip mining.55
- Coal Mines and Mining--Portraits--Group.53
- Coal Mines and Mining--Consolidation Coal Company.16
- Coal Mines and Mining--Surface Mining.10
- Tiger (Power shovel)7
- Automobiles.1
- Coal mines and mining--Ohio--Cadiz.1
- Coal preparation plants--Equipment and supplies.1
- Green Hornet (Power shovel)1
- Strip mining--Ohio--Cadiz.1