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https://etidioh.wordpress.com/2019/07/10/pervasive-arctic-lead-pollution-suggests-substantial-growth-in-medieval-silver-production-modulated-by-plague-climate-and-conflict-proc-natl-acad-sci-usa-abstract/
Pervasive #Arctic #lead #pollution suggests substantial #growth in #medieval #silver production modulated by #plague, #climate, and #conflict (Proc Natl Acad Sci USA, abstract)