Jacobs, John Arthur <br/><br/>
The earth's core and geomagnetism / 
by J. A. Jacobs 
 - Oxford :  Pergamon Press,  1963 
 - vi, 137 p. :  ill. ;  20 cm. 
 - Commonwealth and international library .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth--Internal Structure<br/>Magnetism, Terrestrial