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Eichler, A.; Gramlich, Gabriela; Kellerhals, T.; Tobler, L.; Rehren, Th.; Schwikowski, Margit (2017). Ice-core evidence of earliest extensive copper metallurgy in the Andes 2700 years ago. Scientific Reports, 7(1), p. 41855. Nature Publishing Group 10.1038/srep41855
