Trenches to May 1917. "41st Divn 15-5-17". "Printed by No. 2. Advanced Section. A.P.&S.S. 28/5". Detail, grid and British and German trenches with names black; German wire red., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC17; envelope_number: 479, On reverse: message form.