Abbot, Henry L. "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." Map. S.l: s.n., [1862]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:9s161c27p (accessed April 20, 2024).