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WikiPedia: Tầng_Drum http://palstrat.uni-graz.at/Stratigraphische_Tabel... http://www.gfz-potsdam.de/pb3/pb33/highlights/down... http://norges.uio.no/timescale/Fig11.2_Ord-colA.pd... http://www.stratigraphy.org/ http://www.stratigraphy.org/geowhen/index.html http://www.stratigraphy.org/index.php/ics-chart-ti... //tools.wmflabs.org/geohack/geohack.php?language=v... //www.worldcat.org/search?fq=x0:jrnl&q=n2:0705-379... https://web.archive.org/web/20060518101304/http://...