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WikiPedia: Birkholm http://www.birkholm-beboerforening.dk/ http://www.birkholmhojskole.dk/historie.php http://www.oeturisme.dk/PDF%20dok/Birkholm.pdf http://www.oeturisme.dk/birkholm.htm http://www.sitecenter.dk/oesammenslutningen/birkho... http://www.sydforfyn.dk/birkholm.htm http://www.anhinga.info/haefenklein/birkholm.html //tools.wmflabs.org/geohack/geohack.php?language=v... https://commons.wikimedia.org/wiki/Birkholm?uselan...