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Topical Subjects
- Strip mining.[remove]61
- Power shovels.55
- Coal Mines and Mining--Portraits--Group.44
- Coal mines and mining.43
- Coal Mines and Mining--Surface Mining.12
- Coal Mines and Mining--Consolidation Coal Company.5
- Tiger (Power shovel)5
- Abandoned mined lands reclamation.2
- Automobiles.1
- Grazing.1
- Green Hornet (Power shovel)1