https://vocabularyserver.com/unesco/en/ UNESCO Thesaurus UNESCO UNESCO 2015-09-16 en 2015-09-18 17:47:45 Social mobility 2015-09-18 17:47:45 Social promotion https://vocabularyserver.com/unesco/en/xml.php?skosTema=3759https://vocabularyserver.com/unesco/en/xml.php?skosTema=3769https://vocabularyserver.com/unesco/en/xml.php?skosTema=5446https://vocabularyserver.com/unesco/en/xml.php?skosTema=6822https://vocabularyserver.com/unesco/en/xml.php?skosTema=3782https://vocabularyserver.com/unesco/en/xml.php?skosTema=3800