Bulletin No. 236 
8eries/ A ' Bconomic Geology, 87 
°* nes \B, Descriptive Geology, 42 
DEPARTMENT OF THE INTERIOR 
UNITED STATES GEOLOGICAL SURVEY 
CHARLES D. WALCOTT, Director 
THE 
Porcupine Placer District, Alaska 
BY 
CHARLES W. WRIOHT 
WASHINGTON 
GOVERNMENT PRINTING OFFICfl 
19 04 
