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1.4.47, Clara Barton Monument, Antietam Battlefield National Park, Sharpsburg, Maryland, circa 1941-1970, Box: 4. Institute of American Deltiology Postcard collection, 0007-MDHC. Special Collections and University Archives. https://archives.lib.umd.edu//repositories/2/archival_objects/577902 Accessed September 23, 2021.