Series Number Id: GSGS 3279. Sheet number: parts of sheets 57c SW & 62c NW. Battle of the Somme. "Trenches corrected to 5-8-16." "Ordnance Survey, 1916." Detail, grid and contours grey. All trenches red (including those occupied by British). Title printed on reverse. Manuscript on reverse: 'Signals'., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC14; envelope_number: 377.