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Multiple-Shift Mechanical Mining in some Bituminous-Coal Mines: Progress Report 4. Extraction of Pillars with Mechanized Equipment

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

Published Year

• 1940-1949 (1)
• 1950-1959 (1)

Subject

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

Author

• Toenges, Albert L. (2) *
• Haley, Wilbur A. (1) *
• Maize, Earl R. (1)
• Shields, Joseph J. (1)

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