| Alexander Gardner Burnside Bridge, Across Antietam Creek, Maryland [Gardner's Photographic Sketch Book of the War. Incidents of the War, pl. 20] 1862 Albumen print 17.8 x 22.9 cm (7 x 9 in) American Art Museum, Smithsonian Institution Museum purchase from the Charles Isaacs Collection made possible in part by the Luisita L. and Franz H. Denghausen Endowment LL/7565
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