https://vocabularyserver.com/unesco/en/ UNESCO Thesaurus UNESCO UNESCO 2015-09-16 en 2015-09-18 17:47:14 Industrial pollution 2015-09-18 17:47:14 Chemical pollution https://vocabularyserver.com/unesco/en/xml.php?skosTema=1979https://vocabularyserver.com/unesco/en/xml.php?skosTema=1981https://vocabularyserver.com/unesco/en/xml.php?skosTema=6233https://vocabularyserver.com/unesco/en/xml.php?skosTema=4283https://vocabularyserver.com/unesco/en/xml.php?skosTema=4284https://vocabularyserver.com/unesco/en/xml.php?skosTema=1989https://vocabularyserver.com/unesco/en/xml.php?skosTema=1999https://vocabularyserver.com/unesco/en/xml.php?skosTema=1996