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Antietam prepared by Bvt. Brig. Genl. N. Michler, major of engineers, from surveys under his direction by order of Brig. Genl. & Bvt. Maj. Gen. A.A. Humphreys, Chief of Engineers, and under the authority of the Hon. Secretary of War, 1867 / surveyed and drawn by Maj. J.E. Weyss ; assisted by F. Theilkuhl, J. Strasser & G. Thompson

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