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http://www.iho.int/srv1/index.php?option=com_content&view=article&id=380&Itemid=296&lang=enhttp://www.iho.int/mtg_docs/WHD/2018/WHD2018Backgroundbrief.pdfhttps://en.wikipedia.org/wiki/World_Hydrography_DayEmail your celebration plans to jan@surveyspatialnz.org