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  1. 60 Centuries of Copper: Early Smelting Practice

  2. A primer on old-world metals before the Copper age (revised)

  3. How Did Prehistoric People Extract Metal? | IFLScience

  4. Metallurgy during the Copper Age in Europe - Wikipedia

  5. Chalcolithic - Wikipedia

  6. Copper: An Ancient Metal | Dartmouth Toxic Metals

  7. Innovation, production and specialization in early prehistoric copper ...

  8. (PDF) Chalcolithic copper smelting - Academia.edu

  9. Copper smelting techniques - (Early Metallurgy History) - Vocab ...