Obsidian used for Prehistoric Japanese Tools

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Uploaded by James Blake Wiener, published on 19 December 2017. The copyright holder has published this content under the following license: Creative Commons Attribution-NonCommercial-ShareAlike. This license lets others remix, tweak, and build upon this content non-commercially, as long as they credit the author and license their new creations under the identical terms. When republishing on the web a hyperlink back to the original content source URL must be included. Please note that content linked from this page may have different licensing terms.