Secret, light railways, 'J' Corps area : east of Canal
Series Number Id: UNKNOWN. Sheet number: part of Sheet 28. Canal-Pilckem-Poelcappelle Area. 'J' [XIV] Corps Area. "J Corps Topo Section no. 247". "Revised 8-10-17". Detail (roads, canal, streams) and grid black; light railways green (including those under construction). Used by Major J. C. Thomson, OC 20th Siege Battery., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC18; envelope_number: 554.