https://vocabularyserver.com/thema/en/ Thema – the subject category scheme for a global book trade EDItEUR EDItEUR 2018-10-26 en 2018-10-26 19:13:38 Pressure groups, protest movements & non-violent action 2018-10-26 19:13:38https://vocabularyserver.com/thema/en/xml.php?skosTema=629