the entire directory only in Dating/Obsidian_Hydration

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• International Association for Obsidian Studies (IAOS) - Organization with the goal of providing access to resources that will be of use to the international community of researchers working with obsidian glass. Features articles, news, membership details, bibliography, and links to related sites.
• The Obsidian Clock - A press release from the Oak Ridge National Laboratory reporting that by using secondary ionization mass spectrometry, experimental calibration, and sophisticated modeling methods; is developing a technique to accurately determine when an obsidian tool was crafted.

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