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Topical Subjects
- Coal mines and mining.217
- Coal miners.118
- Coal Mines and Mining--Consolidation Coal Company.100
- Coal Mines and Mining--Preparation Plant Exteriors.94
- Coal preparation plants.89
- Power shovels.79
- Coal Mines and Mining--Miners at Work.77
- Coal-mining machinery.76
- Coal Mines and Mining--Portraits--Group.73
- Strip mining.61
- Coal Mines and Mining--Coal Displays.56
- Coal Mines and Mining--Preparation Plant Interiors.52
- Coal--Transportation.51
- Coal preparation.45
- Coal mines and mining--Equipment and supplies.39
- Coal Mines and Mining--Mine Interiors.38
- Coal Mines and Mining--Laboratories.37
- Coal--Testing.36
- Research, Industrial--Laboratories.36
- Coal Mines and Mining--Exhibit--Uses Of Coal.31