Series Number Id: UNKNOWN. Sheet number: part of sheet 36. Secret, rear defence lines, August 1918. "Secret" in red overprint. "[4th] Field Survey Bn. R.E. (9315) 8-7-18 [numbers stroked out in red overprint and followed with] (9491) 14-8-18." Grey base map., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 676.
Series Number Id: UNKNOWN. Sheet number: part of Sheet 51. Vimy Ridge 1918; Canadian Corps trench and cable route map. "Trenches corrected to 3-5-18." "Field Survey Co R E 5585". Detail, grid and contours grey; all British and German trenches and trench names red (situation fluid). Green and black overprint includes title statement and legend, and shows cable routes in black and green. Neat manuscript additions in green and blue ink., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC18; envelope_number: 561.
Series Number Id: UNKNOWN. Sheet number: part of sheet 36. Secret, Second Army route plan, Ypres Salient, August 1918. "Secret" in black overprint at head of map. "[4th] Field Survey Coy, R.E. (8648) 12-4-18 [numbers stroked out with black overprint and followed with] (9506) 15-8-18." Grey base map with olive-green squaring. Overprint red, green, and black showing Army routes, Corps routes and other routes respectively., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC27; envelope_number: 796.
Series Number Id: UNKNOWN. Sheet number: Part of Sheet 28. Light railway signals gridded outline photostat map. "Buries etc. in use No.2 L.R.S.S. [Light Railway Signals Section]". Lacking date; probably late-1917/early-1918. Used by No.2 Light Railway Signal Company RE. Manscript black and red reference to light railways and cable routes; water shown blue. Includes a "Christmas Cheere" menu, and a note from the British Museum pinned to the map., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC20; envelope_number: 640.