https://vocabularyserver.com/thema/en/ Thema – the subject category scheme for a global book trade EDItEUR EDItEUR 2018-10-26 en 2018-10-26 19:13:37 Social groups: alternative lifestyles 2018-10-26 19:13:37 https://vocabularyserver.com/thema/en/xml.php?skosTema=456