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1.4.47, Union gun crew reenactment and New York State Monument, Antietam Battlefield, 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/577901 Accessed January 18, 2021.