Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Refinación del petróleo bruto-es#Sense
Διύλιση του ακάθαρτου πετρελαίου-el#Sense
Crude-oil refining-en#Sense
Raffineren van ruwe aardolie-nl#Sense
Raffinazione del petrolio greggio-it#Sense
Erdölraffinerie-de#Sense
Raffinage du pétrole brut-fr#Sense
Refinação do petróleo bruto-pt#Sense