Proterosoïkum: Verskil tussen weergawes

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== Eksterne skakels ==
*[http://www.palaeos.com/Proterozoic/Proterozoic.htm Proterosoïkum] {{Webarchive|url=https://web.archive.org/web/20070702223746/http://www.palaeos.com/Proterozoic/Proterozoic.htm |date= 2 Julie 2007 }} - ''Palaeos''
*{{Commons-kategorie inlyn|Proterozoic}}
*{{Wikt-inlyn|Proterosoïkum}}