EXPLORATIONS AND SURVEYS FOR A RAILROAD ROUTE FROM THE MISSISSIPPI RIVER TO THE PACIFIC OCEAN. 
WAR DEPARTMENT. 
REPORT 
EXPLORATIONS FOR A ROUTE FOR THE PACIFIC RAILROAD, 
OP THE LINE OF THE 
FORTY-FIRST PARALLEL OF NORTH LATITUDE. 
LIEUT. E. G. BECKWITH, 
THIRD ARTILLERY. 
