Series Number Id: GSGS 2742; Sheet number: 28 NW; Edition number: 6a, Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC08; envelope_number: 216, Manuscript on face: Divisional markings, tracks and canal bridges in Boesinghe - Poperinghe area; used by Major J.C. Thomson MC (Officer Commanding 20th Siege Battery, 8-inch howitzers)
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