[Second] Army area map, no. 9 : hostile aerodromes opposite Second Army front, June 6th 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 [followed with overprint] (8992) 6-6-18". Grey detail; overprint in red and green. Approximate Allied Front Line shown in red., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 697.