WAR DEPARTMENT. 
REPORT 
OR A 
RECONNAISSANCE 
FROM 
CARROLL, MONTANA TERRITORY, ON THE UPPER MISSOURI, | 
TO THER 
YELLOWSTONE NATIONAL PARK, AND RETURN, 
MADE IN 
THE SUMMER OF 1875, 
BY 
WILLIAM LUDLOW, 
CAPTAIN OF ENGINEERS, BREVET LIEUTENANT-COLONEL, U. 8S. ARMY, 
CHIEF ENGINEER DEPARTMENT OF DAKOTA. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1876. 
