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WikiPedia: NFPA 704 http://204.181.200.232/bcdfacility/msds_main.html http://chemlabs.uoregon.edu/Safety/NFPA.html https://web.archive.org/web/20070428105021/http://... https://web.archive.org/web/20150310145104/http://... https://commons.wikimedia.org/wiki/Category:NFPA_7...