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Factors and conditions that aid in alinement of pillar extraction lines in coal mining

Blasting practices as they affect the roof of coal mines in Ohio, Pennsylvania, and West Virginia

Published Year

• 1930-1939 (2) *

Subject

• Blasting--Safety measures (1)
• Coal mines and mining--Pennsylvania (1)
• Coal mines and mining--Safety measures (1)
• Mining engineering (1)

Author

• Geyer, John Nicholas, (2) *

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