Report of a reconnaissance of the Black hills of Dakota, made in the summer of 1874. [electronic resource]/ By William Ludlow, captain of engineers, Bvt. Lieut. Colonel, U.S. Army.
Electronic text and image data. Ann Arbor, Mich. : University of Michigan, Digital Library Initiatives, 1996. Includes both TIFF files and keyword searchable text. [Making of America] This volume is made possible by a grant from the Andrew W. Mellon Foundation.