Campbell, Wallace H. 1926- Introduction to geomagnetic fields / Wallace H. Campbell. - 2nd ed. - Cambridge, U. K. : Cambridge University Press, 2003. - xii, 337 p. : ill., maps ; 26 cm. Includes bibliographical references (p. 322-331) and index. ISBN: 0521822068 (Hbk.) 0521529530 (pbk.) 9780521822060 (hbk.) : RM624.75 Subjects--Topical Terms: Geomagnetism.