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Studies of roof movement in coal mines.

Studies of roof movement in coal mines.

Published Year

• 1930-1939 (1)
• 1940-1949 (1)

Subject

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

Author

• Greenwald, H. P. (2) *
• Hartmann, Irving (1)
• Maize, E. R. (1)
• Maize, Earl R. (1)
• Rice, G. S. (1)
• Thomas, Edward. (1)

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