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Journal of Sustainable Mining > 2018 > Vol. 17, iss. 1 > 11--19
Journal of Sustainable Mining > 2016 > Vol. 15, iss. 3 > 115--119
Journal of Sustainable Mining > 2018 > Vol. 17, iss. 1 > 11--19
Journal of Sustainable Mining > 2016 > Vol. 15, iss. 3 > 115--119