Edition number: 1. "Trenches corrected from information received up to 3-8-17." "5th Field Survey Coy., R.E. (1352)". Trenches, batteries, strong points etc to 3rd August 1917. "Detail, grid and contours grey; German trenches red; overprint purple (Corps, Divisional & Inter-Brigade boundaries)., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC16; envelope_number: 423, Manuscript pecked blue crayon - British front line?