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Mechanical mining in some bituminous-coal mines.

Mechanical mining in some bituminous-coal mines.

Published Year

• 1950-1959 (2)

Subject

• Bituminous coal industry--United States (2)
• Coal-mining machinery (2) *

Author

• Dowd, J. J. (2)
• Haley, W. A. (2) *
• Shields, J. J. (2)
• Magnuson, M. O. (1)

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