Sheet number: [36c SW1]. Edition number: 5. "Trenches corrected to 19-9-17". Overprint in blue along lower margin: Secret -- T.185, Issued 27/9/17, [1st] Corps Topo Section. "Field Survey Co. R.E. 5077." Stamped in red: No 7 Canadian Siege Battery, Oct 15 1917. Intelligence to 25-9-17 in blue; roads and tracks yellow; detail, grid, British trenches and names grey; German trenches, names & light railways red; tactical intelligence overprint blue. Litho printed in field, overprint on Ellam duplicator. Used by Major J.C. Thomson MC (OC 20th Siege Battery, 8-inch hows). Attached item: typed, duplicated note on 8/15 light machine guns. "Extract of orders issued by Sixth German Army which is opposite us.", Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC17; envelope_number: 498