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Costs of mining under bolted roof and timbered roof in bituminous coal mines
Hydraulic coal mining research :equipment and preliminary tests
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Published Year
1960-1969 (2)
Subject
Coal mines and mining (2) *
Bituminous coal (1)
Coal--Research (1)
Hydraulic mining (1)
Author
Ackerman, M. J. (2) *
Wallace, Joseph J. (2)
Price, George Cletus. (1)
