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Essential factors influencing subsidence and ground movement

Studies of roof movement in coal mines.

Published Year

• 1930-1939 (1)
• 1940-1949 (1)

Subject

• Mine subsidence (2) *
• Coal mines and mining--Pennsylvania (1)

Author

• Crane, Walter R. (1)
• Greenwald, H. P. (1)
• Maize, Earl R. (1)
• Thomas, Edward. (1)

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