Series Number Id: GSGS 3362. [Trenches to January 1917]. "Ordnance Survey, January, 1917". Detail, grid and contours grey; German trenches red; British front pecked grey. Overprint (stamp) twice in purple: Out of Date. Trench map on verso: [Puits No. 14 bis - Bois Hugo], 1917. Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC17; envelope_number: 512.