2019-12-162019-12-16http://hdl.handle.net/1885/1955256 MB1 map171 MB1 map300 dpiimage/jpgimage/tiffenCopyright ExpiredTopographicVietnam -- MapsVietnam, Bac Ninh, Series: L7014, Sheet 6251 III, 1967, 1:50 00019672019-12-16