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