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In page History of Austria:

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By the beginning of the Bronze Age fortifications were appearing, protecting the commercial centers of the mining, processing, and trading of copper and tin. This flourishing culture is reflected in the grave artifacts, such as at Pitten, in Nußdorf ob der Traisen, Lower Austria. In the late Bronze Age appeared the Urnfield culture, in which salt mining commenced in the northern salt mines at Hallstatt.[citation needed]