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.
August 1864. Petersburg, Virginia. "Military telegraph operators at headquarters." Photograph from the main Eastern theater of war, the siege of Petersburg, June 1864-April 1865. View full size. Wet collodion glass plate negative from Civil War photographs compiled by Milhollen and Mugridge.