| Alexander Gardner Bridge on the Boonsboro Pike, Antietam, Md. 1862 (ca) Stereoview, hand-coloured Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s02915 (digital file from original stereograph, front) LC-DIG-stereo-2s02915 (digital file from original stereograph, back) LL/108807
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