Closure in a drivage formed behind and NCB in-seam heading machine : Mallory, R Colliery Guard, V229, N2, Feb 1981, P53–58
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| Published in: | International journal of rock mechanics and mining sciences & geomechanics abstracts 1981, Vol.18 (5), p.94-94 |
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| Format: | Article |
| Language: | eng |
| Online Access: | Get full text |
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| ISSN: | 0148-9062 |