Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Schriftelijk onderwijs-nl#Sense
Cursos por correspondência-pt#Sense
Extension course-en#Sense
Fernstudium-de#Sense
Corsi per corrispondenza-it#Sense
Studi per corrispondenza-it#Sense
Fjernstudium-da#Sense
Études par correspondance-fr#Sense
Estudios a distancia-es#Sense