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Studies of roof movement in coal mines.

Studies of roof movement in coal mines.

Studies of roof movement in coal mines.

Published Year

• 1930-1939 (2)
• 1940-1949 (1)

Subject

• Mine roof control (3) *
• Coal mines and mining (2)
• Coal mines and mining--Pennsylvania (1)

Author

• Greenwald, H. P. (3) *
• Maize, Earl R. (2)
• Hartmann, Irving (1)
• Maize, E. R. (1)
• Rice, G. S. (1)
• Thomas, Edward. (1)

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