Ice-core evidence of earliest extensive copper metallurgy in the andes 2700 years ago

Eichler, A; Gramlich, G; Kellerhals, T; Tobler, L; Rehren, T; Schwikowski, M; (2018) Ice-core evidence of earliest extensive copper metallurgy in the andes 2700 years ago. CHIMIA International Journal for Chemistry , 72 (3) p. 152. 10.2533/chimia.2018.152 .

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