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Mechanical Mining in Some Bituminous-Coal Mines: Progress Report 6. Extraction of Pillars with Mechanized Equipment

Published Year

• 1950-1959 (1) *

Subject

• Bituminous coal industry -- United States. (1)
• Coal-mining machinery. (1) *

Author

• Haley, Wilbur A. (1)
• Shields, Joseph J. (1)
• Toenges, Albert L. (1) *

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