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A study of mine roof of the coking district of Western Pennsylvania

Published Year

• 1930-1939 (1) *

Subject

• Coal mines and mining--Pennsylvania (1)
• Coke--Pennsylvania (1) *
• Industrial accidents--Pennsylvania (1)
• Mine safety--Pennsylvania (1)

Author

• Paul, J. W. (1)
• Plein, Leopold Nicholas, (1)

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