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WikiPedia: Lystrosaurus http://dinosaurs.about.com/od/herbivorousdinosaurs... http://geowords.com/histbooknetscape/i07.htm http://www.palaeos.com/Vertebrates/Units/400Therap... http://www.paleodatabase.org/cgi-bin/bridge.pl?act... https://web.archive.org/web/20060222040556/http://... https://web.archive.org/web/20060427060532/http://...