Steven Stanley, cartographer for The Complete Gettysburg Guide: Walking and Driving Tours of the Battlefield, Town, Cemeteries, Field Hospital Sites, and other Topics of Historical Interest.
James Hessler, Sickles at Gettysburg: The Controversial Civil War General Who Committed Murder, Abandoned Little Round Top, and Declared Himself the Hero of Gettysburg .
Michael F. Nugent, co-author (with Eric J. Wittenberg and J. David Petruzzi) of One Continuous Fight: The Retreat from Gettysburg and the Pursuit of Lee's Army of Northern Virginia, July 4-14, 1863 .