Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Leermiddelen-nl#Sense
Matériel didactique-fr#Sense
Educational aid-en#Sense
Lehr-und Lernmittel-de#Sense
Teaching aid-en#Sense
Leermiddel-nl#Sense