Clays and clay minerals :  proceedings of the twelfth national conference on clays and clay minerals / 
Edited by W. F. Bradley ...[et al.]. 
 - London :  Pergamon press,  c 1964. 
 - 692 p. :  ill. ;  24 cm. 
 - Earth science series ;  19 .
<br/><br/> Includes index. 
<br/><br/>337  337 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economic geology.<br/>Clay--Congresses.
<br/><br/><label>Dewey Class. No.: </label>553 / N213p