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Topical Subjects
- Coal Mines and Mining--Miners at Work.[remove]96
- Coal mines and mining.[remove]96
- Coal miners.86
- Coal-mining machinery.29
- Loaders (Machines)10
- Mine gases--Measurement.7
- Mine railroads.7
- Mine roof bolting.7
- Shuttle cars (Mine haulage)7
- Boring.5
- Electric locomotives.3
- Horses.3
- Coal--Transportation.2
- Coal--Geology.1
- Conveying machinery.1
- Electricity in mining.1
- Mine gases--Testing.1
- Mine railroads--Cars.1
- Mine timbering.1
- Mules.1