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

Published Year

• 1940-1949 (1) *

Subject

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

Author

• Maize, Earl R. (1)
• Toenges, Albert L. (1) *

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