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Journal of Sustainable Mining > 2015 > Vol. 14, iss. 2 > 83--92
Journal of Sustainable Mining > 2015 > Vol. 14, iss. 2 > 108--114
Journal of Sustainable Mining > 2015 > Vol. 14, iss. 2 > 83--92
Journal of Sustainable Mining > 2015 > Vol. 14, iss. 2 > 108--114