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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
Hydraulic coal mining research :assessment of parameters affecting the cutting rate of bituminous coal
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Published Year
1960-1969 (3) *
Subject
Bituminous coal (2)
Coal mines and mining (2)
Hydraulic mining (2)
Coal--Research (1)
Author
Wallace, Joseph J. (3) *
Ackerman, M. J. (2)
Fowkes, Richard S. (1)
Price, George Cletus. (1)
