Civil War Images
Civil War Photographs
Library of Congress Civil War Photographs http://www.loc.gov/pictures/collection/cwp/
American Memory Project Selected Civil War Photographs http://memory.loc.gov/ammem/cwphtml/cwphome.html
National Archives: Matthew Brady Civil War Photos https://www.archives.gov/education/lessons/brady-photos
PBS Images of the Civil War http://www.pbs.org/kenburns/civil-war/photo-gallery/