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Journal of Sustainable Mining > 2015 > Vol. 14, iss. 1 > 21--29
Journal of Sustainable Mining > 2014 > Vol. 13, iss. 1 > 29--37
Journal of Sustainable Mining > 2015 > Vol. 14, iss. 1 > 21--29
Journal of Sustainable Mining > 2014 > Vol. 13, iss. 1 > 29--37