TY - JOUR A1 - Nevanlinna, H. T1 - Results of the Helsinki magnetic observatory 1844-1912 JO - Ann. Geophys. J1 - ANGEO VL - 22 IS - 5 SP - 1691 EP - 1704 Y1 - 2004/04/08 PB - Copernicus Publications SN - 1432-0576 UR - https://angeo.copernicus.org/articles/22/1691/2004/ L1 - https://angeo.copernicus.org/articles/22/1691/2004/angeo-22-1691-2004.pdf DO - 10.5194/angeo-22-1691-2004 ER -