14 DAY USE 



RETURN TO DESK FROM WHICH BORROWED 



EARTH SCIENCES LIBRARY 



This book is due on the last date stamped below, or 



on the date to which renewed. 

 Renewed books are subject to immediate recall. 



LD 21-50m-4,'63 

 (D6471slO)476 



General Library 



University of California 



Berkeley 



