Civil War - Gettysburg and Mr. Lincoln - A dead sniper at the Barricade, Devil's Den, Gettysburg; colorized photo by Matthew Brady from the Library of Congress [copy by Blackhawk Films #166-07], 1863/0705, GCIV 01/06, Box: GCIV 01. Civil War Collection, CIV. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/2092743 Accessed January 30, 2026.