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Diamond drilling blast holes, Bell Mine, the Warner Co., Centre County, Pa.

Diamond-drilling blast holes, Bellefonte Mine, National Gypsum Co., Centre County, Pa.

Diamond-drilling blast holes, Eastern Magnetite Mine C

Published Year

• 1940-1949 (3)

Subject

• Diamond bits (3) *
• Blasting (2)
• Boring machinery (2)
• Rock-drills (2)
• Magnetite mines and mining--Equipment and supplies (1)
• Mineral industries--Pennsylvania (1)
• Mines and mineral resources--Pennsylvania--Centre--Equipment and supplies (1)

Author

• Mosier, McHenry. (3) *

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