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Kỷ NeogenTài liệu tham khảo
WikiPedia: Kỷ_Neogen http://www.merriam-webster.com/dictionary/Neogene http://science.nationalgeographic.com/science/preh... http://dictionary.reference.com/browse/Neogene http://www.inqua.tcd.ie/documents/QP%2016-1.pdf http://www.quaternary.stratigraphy.org.uk/correlat... https://commons.wikimedia.org/wiki/Category:Neogen...