You are looking at a map of Antietam / prepared by Bvt. Brigadier Genl. N. Michler, Major of Engineers, from surveys under his direction, by order of Brigadier Genl. & Bvt. Major Genl. A. A. Humphreys, Chief of Engineers, and under the authority of the Honorable Secretary of War, 1867; surveyed and drawn by Maj: J. E. Weyss, It was made in 1867.
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