Report Measurement of radioactivity in Norway, Annual report for 1991. Berg, T. C. Publication details Series: NILU OR 87/92 Publisher: NILU Year: 1992 ISBN: 82-425-0437-7 File: NILU OR 87/92 (pdf) Link: http://urn.nb.no/URN:NBN:no-nb_digibok_2009092104085