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Diamond drilling and diamond bit investigation
Diamond drilling and diamond bit investigation.
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Published Year
1940-1949 (2)
Subject
Boring (2)
Diamond bits--Testing (2) *
Granite (2)
Author
Obert, Leonard, (2) *
Agnew, Wing G. (1)
Chayes, Felix. (1)
Gabriel, Alton. (1)
Long, Albert. (1)
