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Sealing a coal-mine passageway through a borehole :a progress report
Stoppings for ventilating coal mines
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Published Year
1960-1969 (2)
Subject
Coal mines and mining (2) *
Mine ventilation (1)
Author
Mitchell, Donald W. (2) *
Bercik, George R. (1)
Frances, Angelo. (1)
Kawenski, Edward M. (1)
Murphy, Edwin M. (1)
Nagy, John. (1)
