Earth materials 

 - London:  The Open University Press,  1971. 
 - 83p.:  ill.;  29cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mineralogy<br/>Geochemistry<br/>Petrology
<br/><br/><label>LC Class. No.: </label>QE431.2.O6