http://www.vocabularyserver.com/gemet/en/ GEMET Thesaurus EIONET EIONET 1998-12-31 en 2011-04-14 11:55:52 waste water pollution 2011-04-14 11:55:52http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=10048http://www.vocabularyserver.com/gemet/en/xml.php?skosTema=9135