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medium copper mine sawdust dryer in Edmonton Canada North America

Mar 26, 2021 Mysteriously, the Copper Culture seems to have faded out about 5,400 years ago. “The history is just so peculiar,” Professor Pompeani told the journal Science. Professor Pompeani recently published a new study in the journal Radiocarbon that took a fresh look at 53 carbon dating samples done in earlier research

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