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Diamond-drilling blast holes, eastern Magnetite Mine A

Diamond drilling blast holes, Balmat Mine, St. Lawrence County, N.Y.

Shaft sinking by diamond drilling, Bellefonte mine, National Gypsum Co., Centre County, Pa.

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

Diamond-drilling blast holes, Eastern Magnetite Mine C


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