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Diamond drilling and diamond bit investigation.

Published Year

• 1940-1949 (1)

Subject

• Boring (1)
• Diamond bits--Testing (1) *
• Granite (1)

Author

• Agnew, Wing G. (1)
• Chayes, Felix. (1)
• Gabriel, Alton. (1)
• Long, Albert. (1) *
• Obert, Leonard, (1)

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