371921 



Richthofen, F.P.W. 



The natural system 

 of volcanic rocks. 



QE461 

 R52 



PHYSICAL 

 SCIENCES 

 LIBRARY 



LIBRARY 



UNIVERSITY OF CALIFORNIA 

 DAVIS 



Call Number: 



371921 Q E461 



RichthofenTT.P.W. 



The natural system 

 of volcanic rocks . 



