http://www.vocabularyserver.com/eurovoc/en/http://www.vocabularyserver.com/eurovoc/en/xml.php?skosTema=1922occupational migration http://www.vocabularyserver.com/eurovoc/en/xml.php?skosTema=1922 migration BT http://www.vocabularyserver.com/eurovoc/en/xml.php?skosTema=1922 free movement of workers RT http://www.vocabularyserver.com/eurovoc/en/xml.php?skosTema=1922 right of establishment RT http://www.vocabularyserver.com/eurovoc/en/xml.php?skosTema=1922 frontier worker RT http://www.vocabularyserver.com/eurovoc/en/xml.php?skosTema=1922 migratory labour UF