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![PDF] The Obsidian Evidence for the Scale of Social Life during the Palaeolithic | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/481c2ace563ae2e688627ca2fca0697c4344d002/36-Figure2.1-1.png "PDF] The Obsidian Evidence for the Scale of Social Life during the Palaeolithic | Semantic Scholar")
PDF] The Obsidian Evidence for the Scale of Social Life during the Palaeolithic | Semantic Scholar
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Mohs Hardness Scale
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