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WikiPedia: Tầng Aalen http://stratigraphy.science.purdue.edu/charts/Time... http://strata.ummp.lsa.umich.edu/jack/showgenera.p... http://norges.uio.no/timescale/Fig17.1_Jur_colA.pd... http://norges.uio.no/timescale/Fig17.1_Jur_colB.pd... http://www.stratigraphy.org/ICSchart/ChronostratCh... http://www.stratigraphy.org/bak/geowhen/stages/Aal... http://thesciencedictionary.org/ http://thesciencedictionary.org/aalenian/ https://web.archive.org/web/20060518101431/http://... https://web.archive.org/web/20060518101459/http://...