Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Labour suivant les courbes de niveau-fr#Sense
Konturpflügen-de#Sense
Aratura secondo le curve di livello-it#Sense
Contour ploughing-en#Sense
Labranza en curvas de nivel-es#Sense
Labranza en contorno-es#Sense