EXPLORATIONS AND SURVEYS FOR A RAILROAD ROUTE FROM THE MISSISSIPPI RIVER TO THE PACIFIC OCEAN. 
WAR DEPARTMENT. 
REPORT 
EXPLORATIONS IN CALIFORNIA 
RAILROAD ROUTES, 
TO CONNECT WITH 
THE ROUTES NEAR THE 35TH AND 32D PARALLELS OF NORTH LATITUDE, 
LIEUTENANT R. 8. WILLIAMSON, 
CORPS OF TOPOGRAPHICAL ENGINEERS. 
1853. 
