Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Heizgas-de#Sense
Fuel gas-en#Sense
Brenngas-de#Sense
Heating gas-en#Sense
Gás de combustão-pt#Sense
Gaz de combustible-fr#Sense
Gaz de chauffage-fr#Sense
Gas de combustión-es#Sense
Gás combustível-pt#Sense
Gaz combustible-fr#Sense