Series Number Id: GSGS 3062; Sheet number: 36c SW1; Edition number: 7a, Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC01; envelope_number: 14, Oval hand stamp on face and reverse (cover): +quot;C.O. No.112 M.Gun Coy., Machine Gun Corps+quot;; manuscript: 500 yard strip of squares added to west edge of map in Cite Calonne - Angres sector, with British trenches drawn in, extending over map up to British front line.