Sheet number: [36c NW]. Edition number: 5. "Intelligence Map No. 9. All previous Intelligence Maps to be destroyed." "Trenches corrected to 27-5-18 [with overprint in blue] 15-8-18". "Field Survey Battn. R.E. 6442." Overprint in right margin: T418. Detail, grid & contours grey; German trenches & names red; British trenches and names blue; Intelligence (HQs, dugouts, OPs, MGs, TMs etc.) in blue; roads & tracks yellow. Used by Major J.C. Thomson MC (20th Siege Battery, 8 inch hows)., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC17; envelope_number: 501
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