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Longwall retreat of gate road pillars

Published Year

• 1990-1999 (1)

Subject

• Gate roads (Mining)--Pennsylvania (1)
• Ground control (Mining)--Pennsylvania (1) *
• Longwall mining--Pennsylvania (1)
• Pillaring (Mining) (1)

Author

• Bauer, Eric R. (1)
• Listak, Jeffrey M. (1)

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