Campaign maps, Army of the Potomac / prepared by command of Maj. Gen. George B. McClellan [under direction of] A.A. Humphreys, Brig. Gen. and chief of Top. Engrs. ; compiled by Capt. H.L. Abbot, Top. Engrs., September 1862 ; photographic reduction by L.E.Abbot, Henry L1862]no. 1. Yorktown to Williamsburg -- no. 2. Williamsburg to White House -- no. 3. White House to Harrison's Landing.Relief shown by hachures.cartographic