| Alexander Gardner The slaughter pen at Gettysburg [The War for the Union. Photographic War History, 1861-1865.] 1863, July Stereoview, back 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) LL/108817
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