Series Number Id: GSGS 2742; Sheet number: 28 NE; Edition number: 8a, Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC06; envelope_number: 153, Manuscript of face: Corps and Divisional Boundaries, Left and Right Division etc, and Arc of Fire 10,500 yards from Beck House, OP west of Frezenberg etc.; also light railways, roads and tracks behind British front; many tactical markings in Frezenberg - Passchendaele area; a Battery Commander's map?, used in the Passchendaele attacks, or for its defence after capture.