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WikiPedia: Hồ_Crater http://www.volcano.si.edu/world/volcano.cfm?vnum=1... http://www.nps.gov/archive/crla/notes/vol11-3c.htm http://oe.oregonexplorer.info/craterlake/facts.htm... http://www.klamathtribes.org/vocabulary.html https://web.archive.org/web/20080611203611/http://...