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WikiPedia: Obsidian https://books.google.com/books?id=0-xOM8y6Uc8C&pg=... https://books.google.com/books?id=GUlunYOdWvAC&pg=... https://books.google.com/books?id=P_Ixuott4doC&pg=... https://books.google.com/books?id=hQglAQAAIAAJ&pg=... https://id.loc.gov/authorities/subjects/sh85093752 https://d-nb.info/gnd/4172330-2 https://id.ndl.go.jp/auth/ndlna/00575735 https://www.wikidata.org/wiki/Q53754# https://commons.wikimedia.org/wiki/Category:Obsidi...