Topographic-isostatic reduction maps for Europe and North Atlantic in the Hayford zones 18[kongruenssi]1 for the Airy-Heiskanen system, T = 30 km and 20 km
Topographic-isostatic reduction maps for Europe and North Atlantic in the Hayford zones 18[kongruenssi]1 for the Airy-Heiskanen system, T = 30 km and 20 km
Topographic-isostatic reduction maps for Europe and North Atlantic in the Hayford zones 18[kongruenssi]1 for the Airy-Heiskanen system, T = 30 km and 20 km
Topographic-isostatic reduction maps for Europe and North Atlantic in the Hayford zones 18[kongruenssi]1 for the Airy-Heiskanen system, T = 30 km and 20 km