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Mining Methods and Costs at Crystal-Victory and Minerva Number 1 Fluorspar Mines of Minerva Oil Company, Hardin County, Illinois

Published Year

• 1960-1969 (1)

Subject

• Fluorspar. (1)
• Mineral industries -- Illinois. (1)
• Mining engineering. (1) *

Author

• Daly, J. J. (1)
• Montgomery, Gill (1) *

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