Series Number Id: UNKNOWN. Sheet number: parts of sheets 57 and 66. Fourth Army enemy's railway map, 5 August 1918. "[5th] Field Survey Bn. (3928) 4.7.18." Grey detail; overprint in black showing 3 classes of railways. "Approximate British Front Line 5-8-18" pecked black. Produced as part of the preparations for the Battle of Amiens (8 August 1918)., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC22; envelope_number: 700.
