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. Capt. Rufus D. Pettit's Battery B, 1st New York Light Artillery, in Fort Richardson
PHOTOGRAPHER Barnard, George N., (1819-1902)
CREATED/PUBLISHED 1862 June.
MEDIUM 1 negative : glass, wet collodion.
REPOSITORY Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA
CALL NUMBER LC-B811-0602
REPRODUCTION NUMBER LC-DIG-cwpb-00193 DLC (b&w copy scan)
LC-B8171-0476 DLC (b&w film neg.)
COLLECTION Selected Civil War photographs, 1861-1865 (Library of Congress)
DIGITAL ID (b&w film copy neg.) (b&w copy scan) cwpb 00193
http://hdl.loc.gov/loc.pnp/cwpb.00193
(intermediary roll film) cwp 4a39497
NOTES Civil War photographs, 1861-1865 compiled by Hirst D. Milhollen and Donald H. Mugridge, Washington, D.C. Library of Congress, 1977. No. 0145.
Photograph from the main eastern theater of war, the Peninsular Campaign, May-August 1862.