EXPLORATIONS AND SURVEYS FOR A RAILROAD ROUTE FROM THE MISSISSIPPI RIVER TO TUB PACIFIC OCEAN. 
AVAR DEPARTMENT. 
ROUTE NEAR THE FORTY-SEVENTH AND FORTY-NINTH PARALLELS, EXPLORED BY I. I. STEVENS, 
GOVERNOR OF WASHINGTON TERRITORY, IN 1853 -'55. 
BOTANICAL REPORT. 
WASHINGTON, D. C. 
1 8 5 9. 
