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Ultrasonic convergence measurements
| Author: | McVey, James R. |
|---|---|
| Year: | 1984 |
| Document Type: | BMRA |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.23: 8893 |
| Series: | Report of investigations / Bureau of Mines ; |
| Report Number: | 8893 |
| Subjects: | Mine roof control |
| Ultrasonic testing | |
| Coal mines and mining--Equipment and supplies--Safety measures | |
| Link: | https://hdl.handle.net/2027/mdp.39015078470054 |
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