Ftf. ?: /% 
DEPARTMENT OF THE INTERIOR 
Clemson University 
3 1604 019 891 482 
BULLETIN 
UN 
GEOLOGICAL SURVEY 
No. 17 6 
SOME PRINCIPLES AND METHODS OF ROCK 
ANALYSIS. — HlLLEBRAND 
WASHINGTON 
GOVERNMENT PRINTING OFFIC 
1900 
