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WikiPedia: Kỷ_Devon http://www.mdgekko.com/devonian/index.html http://www.ucmp.berkeley.edu/devonian/devlife.html http://adsabs.harvard.edu/abs/2008Sci...322...64H http://jan.ucc.nau.edu/~rcb7/devpaleo.html http://www.nd.edu/~cneal/al375/Kimb_Geology.html //www.ncbi.nlm.nih.gov/pubmed/18832639 //dx.doi.org/10.1126%2Fscience.1161648 http://www.stratigraphy.org/ http://www.stratigraphy.org/gssp.htm http://www.stratigraphy.org/index.php/ics-chart-ti...