Keywords: Sketch showing Proposed defences of Harrisburg, Pa., and Conowingo Bridge, Md - NARA - 305787.tif Scope and content General notes 305787 Local identifier 77-FORTS-DR145SHT11 War Department Office of the Chief of Engineers 1818 - 09/18/1947 Cartographic and Architectural Records Section Special Media Archives Services Division NWCS-C National Archives at College Park 8601 Adelphi Road College Park MD 20740-6001 ca date 1864 11 24 Record group Record Group 77 Records of the Office of the Chief of Engineers 1789 - 1999 Record group ARC 406 Fortifications Map File Plans of Military Forts compiled 1790 - 1941 Series ARC 305749 File unit File unit ARC Variant control numbers NAIL Control Number NWDNC-77-FORTS-DR145SHT11 yes Other versions <gallery> File Sketch_showing_Proposed_defences_of_Harrisburg _Pa _and_Conowingo_Bridge _Md_-_NARA_-_305787 tif tif File Sketch_showing_Proposed_defences_of_Harrisburg _Pa _and_Conowingo_Bridge _Md_-_NARA_-_305787 jpg jpg </gallery> NARA-cooperation PD-USGov History of Harrisburg Pennsylvania Old maps of Pennsylvania in the American Civil War Susquehanna River 1864 maps NARA TIF images with categorized JPGs |