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v118n11a8 Empirical model of recovery response of copper ...

v118n11a8 Empirical model of recovery response of copper ...

was discovered and first used during the Neolithic Period, or New Stone Age. Though the exact time of this discovery will probably never be known, it is believed to have been about 8000 bce. is found in the free metallic state in nature this native is the material that humans employed as a substitute for stone

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