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Kettlebottoms :their relation to mine roof and support

Clay veins :their occurrence, characteristics, and support

Published Year

• 1980-1989 (2)

Subject

• Coal mines and mining--Safety measures (2) *
• Clay veins (1)
• Ground control (Mining) (1)
• Kettlebottoms (Mining) (1)
• Mine roof control (1)

Author

• Chase, Frank E. (2) *
• Sames, Gary P. (1)
• Ulery, J. P. (1)

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