[Second] Army area map, no. 9 : enemy hospital signs opposite Second Army front (from air photographs), June 6th, 1918
Series Number Id: UNKNOWN. Sheet number: parts of sheets 28 and 36. "[4th] Field Survey Coy. R.E. (8977) 4-6-18 [followed with red overprint] (8993) 6-6-18". Grey detail; overprint in red and green. Approximate Allied Front Line in red. Enemy Hospital Maps were prepared for the Royal Flying Corps/RAF so that hospitals would not be bombed by mistake., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 698.