Series Number Id: UNKNOWN. Sheet number: part of sheet 36. Supplied title in black overprint. Title of sheet used as the base map: Selles, provisional issue. Shows Second Army areas and training facilities, August 1918. "[4th] Field Survey Coy R.E. (8966) 30-5-18 [followed with black overprint] 9695 30-8-18". "Reference" in black overprint. Grey detail; yellow-ochre contours; olive-green squaring. Area east of Boulogne and WSW of St Omer., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC27; envelope_number: 795.