Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.
April 1865. Petersburg, Virginia. "Dead Confederate soldier outside the walls of Fort Mahone." Wet plate glass negative, left half of stereo pair, by Thomas C. Roche. Civil War glass negative collection, Library of Congress. View full size. There's a soundtrack and slide show for these photos here.