Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/6611001
Is Reference of Pithead-en#Sense
Ramp portal-en#Sense
Bocamina-es#Sense
Pit bank-en#Sense
Entrada-es#Sense
Portal-en#Sense
Outlet-en#Sense
Shaft collar-en#Sense
Pit brow-en#Sense