- 
Bulletin No. 236 
Series^' Economic 6eol °gy» 37 
\B, Descriptive Geology, 42 
DEPARTMENT OF THE INTE 
TED STATES GEOLOGIC^^SURY 
THE 
Porcupine Placer District, Alaska 
BY 
CHARLES W. WRIGHT 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1904 
