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Geologic factors causing roof instability and methane emission problems :the Lower Kittanning coalbed, Cambria County, Pa.

Published Year

• 1970-1979 (1) *

Subject

• Coal mines and mining--Pennsylvania--Cambria County (1)
• Firedamp (1)
• Mine roof control (1) *

Author

• Deul, Maurice. (1)
• McCulloch, C. M. (1)

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