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WikiPedia: Houtskär http://192.49.229.35/K2004/e/tulos/kutulos_houtska... http://www.houtskar.fi http://www.houtskar.fi/ //tools.wmflabs.org/geohack/geohack.php?language=v... https://web.archive.org/web/20081226025917/http://... https://web.archive.org/web/20120213235016/http://...