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

Published Year

• 1940-1949 (1)

Subject

• Blasting (1)
• Boring machinery (1)
• Diamond bits (1)
• Mines and mineral resources--Pennsylvania--Centre--Equipment and supplies (1) *
• Rock-drills (1)

Author

• Mosier, McHenry. (1)

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