Series Number Id: GSGS 2742; Sheet number: 36b NE; Edition number: 7, Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC05; envelope_number: 138, Manuscript on cover: 2/Lt J.W. Penniman [? 250th Tunneling Coy RE?]. Manuscript on face: boundaries, few trenches and annotations in Choques - Annezin area (W of Bethune).