Enlace original:
https://wedocs.unep.org//handle/20.500.11822/29230
United Nations Environment Programme
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[Environmental aspects of Selected Non-ferrous Metals (Cu, Ni, Pb, Zn, Au) Ore Mining: A Technical Guide - Technical Report Series No. 5]
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Environmental aspects of Selected Non-ferrous Metals (Cu, Ni, Pb, Zn, Au) Ore Mining: A Technical Guide - Technical Report Series No. 5