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Square-set system of mining

Timber withdrawing and devices used for this purpose in some coal mines

Published Year

• 1930-1939 (2) *

Subject

• Mine timbering (2) *
• Coal mines and mining (1)

Author

• Calverley, Joseph Gladstone, (1)
• Gardner, E. D. (1)
• Paul, J. W. (1)
• Vanderburg, William O. (1)

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