Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Vanha ruskohiili-fi#Sense
Lignite picea-it#Sense
Ældre brunkul-da#Sense
Black lignite-en#Sense
Παλαιός λιγνίτης-el#Sense
Äldre brunkol-sv#Sense
Ältere Braunkohle-de#Sense
Lignite ancien-fr#Sense
Oude bruinkool-nl#Sense
Linhite antiga-pt#Sense
Lignito antiguo-es#Sense