Alexander Gardner 1863, July The slaughter pen at Gettysburg [The War for the Union. Photographic War History, 1861-1865.]
Stereoview Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s02694 (digital file from original stereograph, front) LC-DIG-stereo-2s02694 (digital file from original stereograph, back)
