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- Mine safety.9
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- Coal mines and mining--Safety measures.2
- Mining engineering.2
- Coal mines and mining--Electric equipment.1
- Coal mines and mining--Pennsylvania--Safety measures.1
- Coal mines and mining--West Virginia--Safety measures.1
- Electric cables.1
- Mine communication systems.1
- Mineral industries--Economic aspects.1
- Mineral industries--Safety measures.1
- Mining machinery--Electric equipment.1
- Signals and signaling.1
- Gleim, E. J. (Ernest J.)2
- Crawford, F. S.1
- East, J. H., Jr. 1
- Harrington, D. (Daniel), 1878-1
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- Mather, Joseph V.1
- McCleary, E. H.1
- Mechling, M. J.1
- Miller, Alex U.1
- Mosier, McHenry.1
- Sloman, Harold J. (Harold Jandorf)1
- West Virginia. Department of Mines.1