Summary of Content: Title continues: ”Prepared by Command of Maj. Gen. George B. Mc.Clellan U.S.A. Commd’g Army of the Potomac A.A. Humphreys Brig. Gen. and Chief of Top. Engr’s.” Map compiled by Abbot. Photographed at the Coast Survey Office. A very faint brown-line print on nine pieces of joined wove paper. Inscribed to General Samuel P. Heintzelman by Abbot.