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Falls of roof and coal in bituminous coal-mines

Published Year

• 1920-1929 (1) *

Subject

• Bituminous coal (1)
• Bituminous coal mines and mining (1)
• Bituminous coal--Pennsylvania (1) *
• Coal mine accidents (1)
• Coal mine accidents--Statistics (1)
• Mine accidents (1)

Author

• Adams, William W. (1)

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