£11-2: t7f 
DEPARTMENT OF THE INTKKIOlt 
3 1604 019 891 508 
BULLETIN 
UNIT 
GEOLOGICAL SURVEY 
3STo. 174 
SURVEY OF THE NORTHWESTERN BOUNDARY OF 
THE UNITED STATES, 1857-1861.— Baker 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1000 
