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In August, 1998 and July, 2000, helicopter geophysical surveys were carried out over an area of about 560 km2 immediately west of Hurdalssjøen and the Garder- moen airport. The purpose of the surveys was to provide geophysical informa- tion for improved geological mapping. The data were collected by The Geological Survey of Norway (NGU) personnel and processed at NGU. A combined total of 2780 line-km of VLF, radiometric, and magnetic data were acquired using a nominal 200-m line spacing.