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 LIEU. R. S. WILLIAMSON, CORPS TOPOGRAPHICAL ENGINEERS, IN 1853. 
BOTANICAL REPORT: 
9 
E. DURAND AND T. C. HILGARD, M. D. 
WASHINGTON, D. Cc. 
1855. 
