EXPLORATIONS AND SURVEYS FOR A RAILROAD ROUTE FROM THE MISSISSIPPI RIVER TO THE PACIFIC OCEAN. 
WAR DEPARTMENT. 
ROUTES IN CALIFORNIA, TO CONNECT WITH THE ROUTES NEAR THE THIRTY-FIFTH AND THIRTY-SECOND 
PARALLELS, EXPLORED BY LIEUT. R. S. WILLIAMSON, CORPS TOPOGRAPHICAL ENGINEERS, IN 1853. 
GEOLOGICAL REPORT, 
BY 
WILLIAM P. BLAKE, 
GEOLOGIST AND MINERALOGIST OF THE EXPEDITION. 
WASHINGTON, D. C, 
1857. 
