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EXPLOBATIOXS AND SURVEYS FOB A RAILROAD ROUTE FROM THE MISSISSIPPI RIVER TO THE PACIFIC OCEAN. 



WAR DEPARTMENT. 



BIRDS: 



BY SPENCER F. BAIRD. 



ASSISTANT SECRETARY SMITHSONIAN INSTITDTION. 

 WITH THK CO-OPERATIOH OF 



JOHN CASSIN AND GEORGE N. LAWRENCE. 



WASHINGTON, D. C. 

 1858. 



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