Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Obras públicas-es#Sense
Weg- en waterbouw-nl#Sense
Maa- ja vesirakentaminen-fi#Sense
Génie civil-fr#Sense
Tiefbau-de#Sense
Civiele techniek-nl#Sense
Grond-, water- en wegenbouw-nl#Sense