1. The Earth's magnetic field;Sugiura,1965
2. Report on the variations of the magnetic intensity observed at different points on the earth's surface;Sabine;Brit. Assoc. Adv. Sci. Rep.,1837
3. Australian magnetic observatories;McGregor;Bur. Miner. Resour., Aust. Geol. Geophys.,1979
4. Observations made with the compass on Tasman's voyage and the isogonic lines across the Indian and Pacific Oceans in 1640;van Bemmelen,1898
5. Die Abseichung der Magnetadel; Beobachtungen, Secularvariation, Wert- und Isogonensysteme bizs zur Mitte des XVIIIten Jahrunderts;van Bemmelen,1988