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http://archaeologyinbulgaria.com/2020/11/08/prehistoric-people-owned-40-million-year-old-sea-urchin-fossil-carpathian-obsidian-neolithic-settlement-in-bulgarias-ohoden-pushed-back-to-mesolithic/
Prehistoric People Owned 40-Million-Year-Old Sea Urchin Fossil, Carpathian Obsidian, Neolithic Settlement in Bulgaria’s Ohoden Pushed Back to Mesolithic