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.
MLA
Abbot, Henry L. 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. Corps of Topographical Engineers?, 1862. https://collections.library.yale.edu/catalog/15811291.
APA, 6th edition
Abbot, H. L. (1862). 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. [Maps]. Corps of Topographical Engineers? https://collections.library.yale.edu/catalog/15811291.
