Rare earths 

 - New York:   John Wiley & Sons,   1961 
 - vii, 641p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Management
<br/><br/><label>Subjects--Index Terms: </label>Earth 
<br/><br/><label>Universal Decimal Class. No.: </label>661.865  / K1