Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Underlying strata-en#Sense
Dragende laag-nl#Sense
Onderlaag-nl#Sense
Liegende Schichten-de#Sense
Vloerlaag-nl#Sense
Steunlaag-nl#Sense
Couches sous-jacentes-fr#Sense