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Kettlebottoms :their relation to mine roof and support
Clay veins :their occurrence, characteristics, and support
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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)
