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WikiPedia: Tầng_Langhe http://www.geology.fau.edu/people/petuch.html http://stratigraphy.science.purdue.edu/charts/Time... http://jubilotheque.upmc.fr/fonds-bulsgf/GB_000037... http://pubs.usgs.gov/fs/2007/3015/fs2007-3015.pdf http://www.stratigraphy.org/ICSchart/ChronostratCh... http://www.stratigraphy.org/bak/geowhen/stages/Lan... http://www.stratigraphy.org/index.php/ics-chart-ti... https://web.archive.org/web/20060518100615/http://... https://web.archive.org/web/20100620072033/http://... https://web.archive.org/web/20210115094748/http://...