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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
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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) *
