Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Lodret plan gennem optageretningen-da#Sense
Πρωτεύον επίπεδο-el#Sense
Plan vertical principal-fr#Sense
Hauptlotebene-de#Sense
Principal plane-en#Sense
Hoofdvlak-nl#Sense
Pääpystytaso-fi#Sense
Huvudvertikalplan-sv#Sense