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Topical Subjects
- Coal-mining machinery.53
- Conveying machinery.4
- Electric locomotives.4
- Electricity in mining.1
- Horses.4
- Loaders (Machines)12
- Mine gases--Measurement.6
- Mine gases--Testing.1
- Mine railroads--Cars.5
- Mine railroads.16
- Mine roof bolting.8
- Mine timbering.6
- Mining machinery.6
- Mules.1
- Railroad tracks.1
- Shuttle cars (Mine haulage)15
- Working dogs.1