Williams, Howel <br/><br/>
Petrografia :    /  
Williams, Howel 
 - 1a ed. 
 - Mexico ;   Compaņia Editorial Continental S.A. ,   1968 
 - 430 p. ;   22 cm. :    
<br/><br/><label>Subjects--Index Terms: </label>PETROLOGIA 
<br/><br/><label>Universal Decimal Class. No.: </label>552