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1.7.56, Visitor center, Manassas National Battlefield Park, Manassas, Virginia, circa 1945-1970, Box: 7. Institute of American Deltiology Postcard collection, 0007-MDHC. Special Collections and University Archives. https://archives.lib.umd.edu//repositories/2/archival_objects/577610 Accessed January 18, 2021.