Within both the subtitle and the preface the authors make it clear that they are attempting to explain geomagnetism to a geological audience. Do they succeed? Overall I believe that they just about do but your average geologist, even at graduate level, may well be put off by the maths, especially as it starts so early (pages 3 and 4) in the opening chapter. In my opinion at least some of the mathematical treatment of the opening chapter could have been best avoided or perhaps, better still, confined to an appendix at the end. Throughout the rest of the book...

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