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. 
ZOOLOGICAL REPORT. 
WASHINGTON, D. C. 
1851. 
