GSGS series 4414. Sheet 2516, Second Edition (A.E.F.). [First edition copied from German Topographische Karte 1:25,000 Sheet 2516 dated 1935 and photolithographed by the British Ordnance Survey in 1944]. Second edition revised from air photographs January 1945 by 21 A. Gp Air Survey Group. Lambert modified conical orthomorphic projection. Nord de Guerre Grid.
