A geological map of the Black Hills: by Professor N.H. Winchell

A geological map of the Black Hills: by Professor N.H. Winchell to accompany the report of Capt. William Ludlow U.S. Engineers. (to accompany) Report of a reconnaissance of the Black Hills of Dakota, made in the summer of 1874. By William Ludlow, Captain of Engineers, Bvt. Lieut. Colonel, U. S. Army; Chief Engineer Department of Dakota. Washington : Government Printing Office. 1875.

United States. Army. Corps of Engineer

1874

1875

Government Printing Office

1:380 160

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