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Reducing Hazards in Underground Coal Mines Through the Recognition and Delineation of Coalbed Discontinuities Caused by Ancient Channel Processes

Published Year

• 1980-1989 (1)

Subject

• Coal -- Geology -- Pennsylvania -- Armstrong County. (1)
• Coal -- Geology -- Pennsylvania -- Indiana County. (1)
• Coal mines and mining -- Pennsylvania -- Armstrong County -- Safety measures. (1)
• Coal mines and mining -- Pennsylvania -- Indiana County -- Safety measures. (1)
• River channels. (1) *

Author

• Kertis, Carla A. (1) *

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