Enlace original:
https://wedocs.unep.org//handle/20.500.11822/11574
U.S. Department of State and Biodiversity Research Institute
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[Case Study: Piura, Peru Artisanal miners near the border with Peru and Ecuador learn mining theory and practice]
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Case Study: Piura, Peru Artisanal miners near the border with Peru and Ecuador learn mining theory and practice