Itinerary of the Army of the Potomac, and co-operating forces in the Gettysburg campaign, June 5 - July 31, 1863; organization of the Army of the Potomac and Army of northern Virginia at the battle of Gettysburg; and return of casualties in the Union and Confederate forces
United States. Adjutant-General's Office; Drum, Richard C. (Richard Coulter), 1825-1909