Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/6616
Is Reference of Estrazione e raffinazione dei combustibili liquidi-it#Sense
Εξόρυξη και διύλιση υγρών καυσίμων-el#Sense
Gewinnung und Verarbeitung fluessiger Brennstoffe-de#Sense
Extraction and refining of liquid fuels-en#Sense
Extracción y refino de los combustibles líquidos-es#Sense
Extraction et raffinage des combustibles liquides-fr#Sense