Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Όριον προφυλάξεως-el#Sense
Seuil de protection-fr#Sense
Grenswaarde van de bescherming-nl#Sense
Limites de proteção -pt#Sense
Límites de protección-es#Sense
Toxic threshold-en#Sense
Protective threshold-en#Sense
Toxic sill-en#Sense
Soglia di protezione-it#Sense