From Tomes, Robert. The war with the South. New York, Virtue & Yorston, 1862-1867, v. 2, between p. 426 and 427.
Signed (facsim.): Charles: Sholl, Topl. Engineer.
"Entered according to act of Congress AD. 1864 by Virtue, Yorston & Co."
Caption in lower margin: A topographical map of the battle field at Antietam from an actual survey by an engineer officer on General Doubleday's staff.
Description derived from published bibliography.