Series Number Id: GSGS 3681. Sheet number: part of sheet 57. Enemy's railways map, Belgium, 10 November 1918. "Railways 10-11-18" in purple overprint along with "Reference". "Printing Company, R.E., W.O.B./2294." "Ordnance Survey, October, 1918." Grey detail, blue water, green squaring., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC16; envelope_number: 460.
Series Number Id: UNKNOWN. Sheet number: part of sheet 27. In black overprint: Secret, [Second] Army Railways 6-18 [June 1918]. "[4th] Field Survey Coy., R.E. (8731) 30-4-18 [followed with black overprint] (9161c) 16-6-18". "Reference" with railway details also in black overprint. Grey detail and squaring; relief-layered in tints of buff (brownish-yellow colour)., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC19; envelope_number: 576.
Series Number Id: UNKNOWN. Sheet number: part of sheet 36. Edition number: 5. "Secret, First Army ammunition supply system" in red overprint in right margin. "First Army railways" in black overprint in right margin. "[1st] Field Survey Co. R.E. 5643 [numbers crossed out with black overprint and followed with] 5924 [crossed out with red overprint and replaced with] 5925". Grey base map of whole First Army area, from Ploegsteert in the north to Arras in the south, and as far west as Hesdin. "Reference" in right margin includes railway entries in black overprint, and ammunition supply details in red overprint., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 681.
Series Number Id: UNKNOWN. Sheet number: part of sheet 36. Edition number: 5. "Secret" in red overprint. "First Army Railways" in right margin with "Reference" in black overprint. Shows broad [i.e. standard] gauge, double and single, in black; 60 cm gauge and 60 cm gauge proposed in red; metre gauge, trench tramways, and present Front Line in red. "[1st] Field Survey Co. R.E. 5643 [numbers crossed out and followed with black overprint] 5924." Grey base map of whole First Army area, from Ploegsteert in north to Arras in south, and as far west as Hesdin., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 680.
Series Number Id: UNKNOWN. Sheet number: part of sheet 36. Edition number: 5. Grey base map of whole First Army area, from Ploegsteert in the north to Arras in the south, and as far west as Hesdin. "Reference" in black and red overprint. "[1st] Field Survey Co. R.E. 5643 [numbers crossed out with black overprint and followed with] 5924 [crossed out with red overprint and replaced with] 5946.", Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 690.
Series Number Id: UNKNOWN. Sheet number: part of sheet 36. Edition number: 5. Grey base map of whole First Army area, from Ploegsteert in the north to Arras in the south, and as far west as Hesdin. "Reference" in black and red overprint. "[1st] Field Survey Co. R.E. 5643 [numbers crossed out with black overprint and followed with] 5924 [crossed out with red overprint and replaced with] 5945.", Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 691.
Series Number Id: UNKNOWN. Sheet number: part of sheet 36. Edition number: 9. "[1st] Field Survey Battn. R.E. 6839 [numbers crossed out with black overprint and followed with] 6982". Grey detail; overprint in black and red., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 689.
Series Number Id: UNKNOWN. Sheet number: part of sheet 36. Secret, Second Army railways, June 1918. "[4th] Field Survey Coy., R.E., (8648) 12-4-18 [followed with red overprint] (8991) 12-6-18". "Ordnance Survey, (O.B.) April, 1918." Grey base map with olive-green squaring; overprint in purple, red, and green., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 699.