[Second] Army area map, no. 9 : hostile aerodromes opposite Second Army front, August 23rd, 1918 (from air photographs)
Series Number Id: UNKNOWN. Sheet number: parts of sheets 28 and 36. "[4th] Field Survey Coy. R.E. (8977) 4-6-18 [numbers overlapped with red overprint] (9553) 22-8-18". Grey detail; olive green grid; overprint in red and green. Approximate Allied Front Line, August 23rd 1918, show in green., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC27; envelope_number: 797.