Sheet number: 51BNW2 + 4 (Part of). "Corrected to 14-4-17." "J. [XVII] Corps T[opo].S[ection]. no M.8 (a)". Area covers Gavrelle with German trenches to W of village, area 1,000 yards N, 1,200 yards S and 2,000 yards E to Hollow Copse, Railway Copse and Square Wood. Detail and grid grey; German trenches and names continuous red; British trenches pecked red. Printed in field on Corps Ellam duplicator. Used by Major J.C. Thomson MC (OC 20th Siege Battery, 9-inch hows)., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC17; envelope_number: 483