Bloxham, J. Geomagnetic secular variations J. Bloxham, D. Gubbins and A. Jackson - London Royal Society of London 1989 - p.417-502 col. plates;illus;refs Phil Trans of Royal Soc of London A v329, p.415-502 Subjects--Topical Terms: GeomagneticSecular Variation Universal Decimal Class. No.: 550.38 / BLO