The complete photo is at the Library of Congress Online, and is part of their Civil War Photograph collection.
TITLE/LABEL Fair Oaks, Va., vicinity. Lt. Robert Clarke, Capt. John C. Tidball, Lt. William N. Dennison, and Capt. Alexander C.M. Pennington
PHOTOGRAPHER Gibson, James F. (b. 1828).
CREATED/PUBLISHED 1862 June.
MEDIUM 1 negative : glass, stereograph, wet collodion.
REPOSITORY Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA
CALL NUMBER LC-B811- 0435A
REPRODUCTION NUMBER LC-DIG-cwpb-01024 DLC (b&w copy scan of left half)
LC-B8171-0435 DLC (b&w film copy neg.)
COLLECTION Selected Civil War photographs, 1861-1865 (Library of Congress)
DIGITAL ID (b&w copy scan) cwpb 01024 http://hdl.loc.gov/loc.pnp/cwpb.01024
(intermediary roll film) cwp 4a39482
NOTES Civil War photographs, 1861-1865 compiled by Hirst D. Milhollen and Donald H. Mugridge, Washington, D.C. Library of Congress, 1977. No. 0078.
Photograph from the main eastern theater of war, the Peninsular Campaign, May-August 1862.