Series Number Id: GSGS 3137. Sheet number: [part of sheet 57]. [Reduced from 1:10,000 sheets 57d SE2 and 57c SW1 Le Sars (part of), 57c SW3 Longueval, 62c NW1 Maricourt, and 62c NW3 Vaux (less 1,000 yard strip at foot)]. Somme Battlefield, trench map 1916. "Trenches corrected to January 19th, 1916." "Ordnance Survey 1916." Detail, grid and contours grey, water pale blue. German trenches and 4-fig coordinates red; British/Allied Front Line pecked blue. Showing the situation before the loss of Frise by the French in January 1916. Four regular-series 1:10,000 trench maps, photographically reduced, so showing exactly the same detail. The southern part of Third Army (later Fourth Army) front. Title printed on reverse., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC14; envelope_number: 372.