EXPLORATION 
OF THE 
COLORADO RIVER 01 THE WEST 
AND 
ITS TRIBUTARIES. 
EXPLORED IN 
1869, 187O, 1871, and 1873, 
UNDElt THE 
DIRECTION OF THE SECRETARY OF THE SMITHSONIAN INSTITUTION. 
WASHINGTON: 
GOVERNMENT F 11 I N T I N G OFFICE 
1875. 
