Map of the battle field of Gettysburg, July 1st, 2nd, 3rd 1863
"The map is reduced from one on a scale of 200 feet to the inch, deposited in the Archives of the office of the Chief of Engineers. The survey was ordered by Brevet Major General A. A. Humphreys, Chief of Engineers, and conducted under Brevet Major General G. K. Warren, Major of Engineers." "Topography engraved by Julius Bien . . . N.Y. Positions & ...
Bachelder, John (John Badger) - Bien, Julius - Neuman, Louis E. - United States. Army. Corps of Engineers