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1. Magnetic results from Helsinki Magnetic Meteorological Observatory : Part IV. Declination 1880-1909. Summary of Observations 1844-1909 / Heikki Nevanlinna e Anneli KetolaPublication: Helsinki : Finnish Met. Institute, 1994Description: 144 p. ; 25 cmAvailability: Items available for loan: Biblioteca da Sede[E.20] (1).

2. Magnetic results from Helsinki Magnetic Meteorological Observatory : Part III. Declination 1854-1880. Geomagnetic Activity 1844-1880 / H. Nevanlinna, A. KetolaPublication: Helsinki : Finnish Met. Institute, 1993Description: 194 p. ; 25 cmAvailability: Items available for loan: Biblioteca da Sede[E.20] (1).

3. Magnetic results from Helsinki Magnetic-Meteorological Observatory : part II: Geomagnetic Activity 1844-1856 / H. Nevanlinna, A. KetolaPublication: Helsinki : Finnish Met. Institute, 1992Description: 65 p. ; 25 cmAvailability: Items available for loan: Biblioteca da Sede[E.20] (1).

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