Geomagnetism Vol. II. J.A. Jacobs (Editor), Academic Press, New York, 1987, #62.00, ISBN V2 0 12 378672 8 Chapter 1: Magnetohydrodynamics of the Earth's core (D. Gubbins and P.H. Roberts) Chapter 2: Origin of the main field: kinematics P.H. Roberts and D.