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- Coal Mines and Mining--Miners at Work.✖[remove]6
- Coal miners.✖[remove]6
- Coal mines and mining.6
- Coal-mining machinery.✖[remove]6
- Boring.1
- Electricity in mining.1
- Loaders (Machines)1
- Mine roof bolting.1
- Consolidation Coal Company. Jamison Mine no. 9.✖[remove]6
- Stonega Coke and Coal Company.3