Bachelder, John B. (John Badger), 1825-1894Positions of troops compiled and added for the government by John B. Bachelder.; "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."; Relief shown by form lines and spot heights.72 x 68 centimetersJPEGUMN_ALMA:9940801530001701engPublished by authority of the Hon. the Secretary of War, Office of the Chief of Engineers U.S. Army (Washington, D.C.?)PublicMap of the battle field of Gettysburg, July 1st, 2nd, 3rd 1863MapsUniversity of Minnesota