LRE thesaurus European Schoolnet europe,multimedia educational materials and Content of teaching, guidance, evaluation and administration 2010-09-25 2012-04-30 19:07:42 nl leeftijdsgroepen aldersklasse Altersklasse ομάδα ηλικίας age group clase de edad ikäryhmä életkori csoport classi di età קבוצת גיל åldersgrupp 2010-09-25 07:34:18