International Clay Conference, 1972: proceedings of the International Clay Conference 1972 held in Madrid, Spain, June 23-30  (Book) 

 - Madrid, Spain  Division de Ciencias C.S.I.C.  1973 
 - 848p.  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clay minerals--Congresses
<br/><br/><label>Universal Decimal Class. No.: </label>553.61:061.3(100) INT  / 7320