Washington County Maryland Prepared under the direction of Lieut. Col. J.N. Macomb Chf. Topl Engr for the use of Maj. Gen. Geo.B. McClellan Commanding Army of Potomac 1861. Drawn from Thomas Taggart's map by E. Hergesheimer, Photographs by G. Mathiot & D. Hinkle by permission of Prof. Bache Supt U.S. Coast Survey