Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Creusement des galeries au rocher-fr#Sense
Stone drifting-en#Sense
Tunnelling-en#Sense
Stone drivage-en#Sense
Drifting-en#Sense
Gateroad drivage in stone-en#Sense