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WikiPedia: Ertholmene http://www.bslf.dk/sogne/chr-oe.asp http://www.chnf.dk/lister/yf1.html http://www.christiansoe.dk/ http://www.bornholm.nu/?Id=10317 http://www.bornholm.nu/?Id=7904 http://www.wikimapia.org/#y=55321649&x=15183063&z=... //tools.wmflabs.org/geohack/geohack.php?language=v... https://web.archive.org/web/20070311064244/http://... https://web.archive.org/web/20091214044524/http://... https://commons.wikimedia.org/wiki/Category:Erthol...