GSGS series 4414. Sheet 2122, Second Edition (A.E.F.). Copied from German Topographische Karte 1:25,000 Sheet 2122 dated 1936 and photolithographed by the British Ordnance Survey in 1944. Area indicated on reliabilty diagram revised from Air Photographs March 45. by 21 A.Gp Air Survey Group. Lambert modified conical orthomorphic projection. Nord de Guerre Grid.
