EXPLORATIONS AND SURVEYS FOR A RAILROAD ROUTE FROM THE MISSISSIPPI RIVER TO THE PACIFIC OCEAN. 



WAR DEPARTMENT. 



REPORT 



LIEUT. HENRY L. ABBOT, 



CORPS OF TOPOGRAPHICAL ENGINEERS 



EXPLORATIONS FOR A RAILROAD ROUTE, 



THE SACRAMENTO VALLEY TO THE COLUMBIA RIVER, 



LIEUT. R. S. WILLIAMSON, 



CORPS OF TOPOGRAPHICAL ENGINEERS, 



ASSISTED RY 



LIEUT. HENRY L. ABBOT, 



CORPS OF TOPOGRAPHICAL ENGINEERS. 



1855. 

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