| Brady's National Photographic Portrait Galleries Slave pen, Alexandria, Va. [The War for the Union. Photographic History.] 1861-1865 (taken) 1869-1875 ? Print) Stereoview Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s04354 (digital file from original item, front) LC-DIG-stereo-2s04354 (digital file from original item, back) LL/108696 Stereograph shows the interior of a Union military prison; prior to its capture by the Union Army in 1861, the facility had been used by Price, Birch & Co. slave dealership to hold slaves before they auctioned. (Source: The Center for Civil War Photography, http://www.civilwarphotography.org/index.php/3-d-photographs-exhibit/70)
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