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Journal of the Southern African Institute of Mining and Metallurgy
versión On-line ISSN 2411-9717

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MERWE, J. N. van der. Rock engineering method to pre-evaluate old, small coal pillars for secondary mining. J. S. Afr. Inst. Min. Metall. [online]. 2012, vol.112, n.1, pp. 1-6. ISSN 2411-9717.


 


 

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