Library of Congress
Sized, cropped, and adjusted for use here by John Osborne, Dickinson College, July 7, 2010.
Prints and Photographs Division, Library of Congress
Selected Civil War Photograph Collection, Library of Congress
Summary from Library of Congress:
Photograph from the main eastern theater of the war, Meade in Virginia, August-November 1863. Left to right: Lt. Samuel S. Elder, 4th U.S., Batt. E.; Lt. Alanson M. Randol, 1st U.S., Batts. E & G.; Lt. C. K. Warner; Lit. Alex C. M. Pennington, 2d U.S., Batt. M.; Lt. Rufus King, Jr., 4th U.S. Batt. A.; Lt. T. Riley; Lt. H. B. Read.
Cropped from larger version of this photograph, also available here.