"Chesapeake & Ohio Canal, national historical park, District of Columbia/Maryland."; "United States. National Park Service."; "Chesapeake and Ohio Canal National Historical Park."; "United States. National Park Service."; "1978"; "

Government. \"GPO:1978--261217/16, Reprint 1978\". Includes map.

"; ""; "P20453"; "pec"; "Chesapeake and Ohio Canal National Historical Park."; "14256"; .