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Automatic derailing switch at Roslyn no. 3 mine, Northwestern Improvement Company, Roslyn, Wash.

The Bureau of Mines coal-sampling truck

Published Year

• 1930-1939 (2) *

Subject

• Coal mines and mining--Equipment and supplies (1)
• Mine safety--Washington (State) (1)
• Mines and mineral resources--Washington (State) (1)

Author

• Kudlich, Rudolf H., (2) *
• Ash, S. H. (1)

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