Series Number Id: GSGS 2742. Sheet number: 57c NE. Edition number: 8a (local). "Enemy organisation, 22-9-18". "Trenches revised from information received to 21-9-18." In lower, left margin: Field Survey Bn. (10807) 15-9-18 [numbers stroked out with red overprint and replaced with following] 10832 24-9-18., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC25; envelope_number: 748