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WikiPedia: Lanthan http://www.webelements.com/webelements/elements/te... http://www-d0.fnal.gov/hardware/cal/lvps_info/engi... http://periodic.lanl.gov/elements/57.html https://web.archive.org/web/20110917100217/http://... https://commons.wikimedia.org/wiki/Lanthanum?usela...