Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Open ditch draining-en#Sense
Fossi scoperti-it#Sense
Affossatura aperta-it#Sense
Drenaje por zanjas abiertas-es#Sense
Drainage par tranchées ouvertes-fr#Sense
Entwässerung mittels offener Gräben-de#Sense