Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Norg-nl#Sense
Azote organique-fr#Sense
Organischer Stickstoff-de#Sense
Organic nitrogen-en#Sense
ON-en#Sense
Norg-fr#Sense
Norg-de#Sense
Organische stikstof-nl#Sense