http://www.vocabularyserver.com/gemet/en/ GEMET Thesaurus EIONET EIONET 1998-12-31 en 2011-04-14 11:56:24 bacteriological pollution 2011-04-14 11:56:24http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=10048http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=11675