Entitled: "Front of slave pen, Alexandria, Virginia" showing a Union army guard and other men in front of a building designated Price, Birch & Co., dealers in slaves, at 1315 Duke Street,
Alexandria, Virginia. Slave pen. Interior view | Library of Congress
Alexander Gardner, Pywell. Slave Pen, Alexandria, Virginia. August 1862 | MoMA
A Hidden History: Alexandria's Slave Pen and the Domestic Slave Trade – The Gettysburg Compiler