Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Degré de houillification-fr#Sense
Coal rank-en#Sense
Grado de carbonización-es#Sense
Inkolingsgraad-nl#Sense
Rang-fr#Sense
Βαθμός ενανθρακώσεως-el#Sense
Inkolningsgrad-sv#Sense
Hiiletysaste-fi#Sense
Rango-it#Sense
Grau de carbonização-pt#Sense
Degré d'évolution-fr#Sense
Grado di fossilizzazione-it#Sense
Hiiltymisaste-fi#Sense
Inkohlungsgrad-de#Sense
Forkoksningsgrad-da#Sense