Series Number Id: GSGS 3062; Sheet number: 57d SE4; Edition number: 2, Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC02; envelope_number: 46, manuscript: British battery position west of Aveluy Wood, and arc of fire including Pozieres and La Boisselle. Targets marked in German lines east of Authuille Wood and in Ovillers. Reconnaissance notes and markings in Becourt - Sausage Valley - Contalmaison area. OPs marked on Usna and Tara Hills and Maxse Redoubt. Reference in margin to 60 pounder battery and field battery; manuscript on attached +quot;Albert+quot; 1:40,000 scale map: arc of fire of same battery with zero line running through centre of Mametz Wood [Ovillers church as aiming point?].