The Earth : Its Shape, Internal Structure and Composition 

 - Milton Keynes:  The Open University Press,  1971. 
 - 118p.;  ill.  30cm 
<br/><br/><label>ISBN: </label>0335020348 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, hydrology & meteorology
<br/><br/><label>Dewey Class. No.: </label>551  / EAR