The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 7: Prisons and Hospitals.
Francis Trevelyan Miller, Ed.

Army surgeons in the field.

The army surgeon in the field had clerical duties as well as medical. An elaborate system of records, upon which the accuracy of the whole pension system of the Government rests, had to be maintained. Here the mortality statistics of the first division, Ninth Corps, Army of the Potomac, were collected and preserved. The field desks had handles on the end, as seen, and were easily portable.

The first-hand records of the pension system quarters of chief of ambulance, first division, ninth corps, in front of Petersburg, 1864

Part of the General hospital at City Point—the James river in the distance