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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

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)

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