Old Copper Culture tools : copper tools from Northern Wisconsin, 4,000-1,200 B.C. - Turning Points in Wisconsin History - Wisconsin Historical Society Online Collections
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Ancient Native Americans were among the world's first coppersmiths | Science | AAAS
Copper Gardening Tools - Copper Traces PKS BRONZE
Tools and weapons made of copper and bone/ antler. Copper items from... | Download Scientific Diagram
Ancient Native Americans were among the world's first coppersmiths | Science | AAAS