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Electrical blasting practice as some coal mines in state of Washington

Systematic timbering rules at the Washington coal mines

Explosions in Washington coal mines

Falls of roof and coal in Washington mines

Unwatering flooded coal mines in Washington

Published Year

• 1930-1939 (5) *

Subject

• Coal mines and mining--Washington (State) (5) *
• Blasting (1)
• Mine drainage (1)
• Mine explosions (1)
• Mine roof control--Washington (State) (1)
• Mine timbering--Washington (State) (1)

Author

• Ash, S. H. (5)
• Murphy, Thomas, (1)

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