Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/52
Is Reference of Radioactivité naturelle-fr#Sense
Luonnon radioaktiivisuus-fi#Sense
Naturlig radioaktivitet-sv#Sense
Radioatividade natural-pt#Sense
Naturlig radioaktivitet-da#Sense
Natuurlijke radioactiviteit-nl#Sense
Natürliche Radioaktivität-de#Sense
Radioattività naturale-it#Sense
Φυσική ραδιενέργεια-el#Sense
Radiactividad natural-es#Sense
Natural radioactivity-en#Sense