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Agricultural production and the optimal level of landscape preservation
Brunstad, Rolf Jens, (1999)
Kvalitetsklassifisering av jordbruksareal i arealregnskapet
Engebretsen, Øystein, (1986)
Official versus unregistered change of agricultural land in Norway : extent, legitimacy and regional distributional effects
Røsnes, August E., (1985)
Fordelingen av jordbruksarealet i Sør-Norge
Låg, J., (1959)
Some relationships between soil conditions and distribution of different forest vegetation
Låg, J., (1971)