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WikiPedia: Hyperion (cây) http://www.mdvaden.com/redwood_hyperion.shtml http://www.odditycentral.com/news/meet-hyperion-th... http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2... http://www.conifers.org/cu/Sequoia.php http://www.savetheredwoods.org/league/pdf/srl_newy... http://www.bbc.co.uk/programmes/b01bwmw4 https://www.factpros.com/facts-about-hyperion/ https://archive.org/details/wildtreesstoryof00pres https://archive.org/details/wildtreesstoryof00pres... https://web.archive.org/web/20101206130144/http://...