1. Official plan of the siege of Yorktown, Va. conducted by the Army of the Potomac under command of Creator: Abbot, Henry L Published / Created: 1862?] Call Number: 783hc 1862K Container / Volume: BRBL_00511 Image Count: 1 Resource Type: Maps, Atlases & Globes Found in: Beinecke Rare Book and Manuscript Library > Official plan of the siege of Yorktown, Va. conducted by the Army of the Potomac under command of Maj. Gen. George B. McClellan U.S.A., April 5th to May 3rd 1862 / prepared under the direction of Brig. Gen. J.G. Barnard, Chief Engr. by Lieut. Henry L. Abb