GSGS series 4414. Sheet 2427, Second Edition (AEF). First edition copied from German Topographische Karte 1:25,000 Sheet 2427 dated 1937 and photolithographed by the British Ordnance Survey in 1944. Second edition revised from air photographs April 1945 by the 655th Eng. (Top.) Bn. Lambert modified conical orthomorphic projection. Nord de Guerre Grid.