Into the earth earthquakes seismology and the earth's magnetism  units 5-6 

 - Walton  Open university  1995 
 - 106p.  30cm. 
<br/><br/><label>ISBN: </label>0335163270 
<br/><br/><label>Subjects--Topical Terms: </label><br/>GEOLOGY HYDROLOGY METEOROLOGY
<br/><br/><label>Dewey Class. No.: </label>551  / OPE