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Electrical blasting practice as some coal mines in state of Washington

Systematic timbering rules at the Washington coal mines

Falls of roof and coal in Washington mines

Published Year

• 1930-1939 (3)

Subject

• Coal mines and mining--Washington (State) (3) *
• Blasting (1)
• Mine roof control--Washington (State) (1)
• Mine timbering--Washington (State) (1)

Author

• Ash, S. H. (3)

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